[ 
https://issues.apache.org/jira/browse/LOG4J2-1576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15575433#comment-15575433
 ] 

Lukas Krejci commented on LOG4J2-1576:
--------------------------------------

Based on discussion with Remko, I fixed a couple of things in Revapi and took a 
stab at integrating it into Log4j2's build here:
https://github.com/metlos/logging-log4j2/tree/revapi-build-and-site-integration

To see some failures being caught, either introduce some incompatible change to 
the code ;) or override the automatically detected old version using the 
{{-Drevapi.oldVersion=x.y.z}} parameter.
{code}
mvn clean install
{code}
is enough to see the build-time checks in action.
{code}
mvn site -Dmaven.javadoc.skip
{code}
to see the site reports (skipping javadoc generation because that is currently 
failing (at least for me)).

The top level module will contain the aggregate report containing the API 
changes from all the transitive sub modules. Individual projects will then 
contain a report on API changes in that particular project.

> Better automated backwards compatibility checking
> -------------------------------------------------
>
>                 Key: LOG4J2-1576
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1576
>             Project: Log4j 2
>          Issue Type: Improvement
>    Affects Versions: 2.7
>            Reporter: Remko Popma
>             Fix For: 2.8
>
>
> I have trouble running Clirr on a machine that only has Java 8 (ran into the 
> "Invalid byte tag in constant pool" problem) so I started to look at 
> alternatives. These two seem promising:
> * [javacmp|https://siom79.github.io/japicmp/]
> * [Revapi|http://revapi.org/]
> h4. Revapi Configuration
> More docs are [here|http://revapi.org/getting-started.html]. Very quick:
> $\{root}/pom.xml
> {code}
> <plugin>
>   <groupId>org.revapi</groupId>
>   <artifactId>revapi-maven-plugin</artifactId>
>   <version>0.5.1</version>
>   <dependencies>
>     <dependency>
>       <groupId>org.revapi</groupId>
>       <artifactId>revapi-java</artifactId>
>       <version>0.10.1</version>
>     </dependency>
>   </dependencies>
>   <configuration>
>   </configuration>
>   <executions>
>     <execution>
>       <id>api-check</id>
>       <goals><goal>check</goal></goals>
>     </execution>
>   </executions>
> </plugin>
> {code}
> $\{root}/log4j-api/pom.xml and $\{root}/log4j-core/pom.xml
> {code}
> <plugin>
>   <groupId>org.revapi</groupId>
>   <artifactId>revapi-maven-plugin</artifactId>
>   <version>0.5.1</version>
>   <configuration>
>     <oldArtifacts>
>       <artifact>${project.groupId}:${project.artifactId}:2.6.2</artifact>
>     </oldArtifacts>
>     <newArtifacts>
>       
> <artifact>${project.groupId}:${project.artifactId}:${project.version}</artifact>
>     </newArtifacts>
>   </configuration>
>   <executions>
>     <execution>
>       <id>api-check</id>
>       <goals><goal>check</goal></goals>
>     </execution>
>   </executions>
> </plugin>
> {code}
> $\{root}/log4j-bom/pom.xml
> {code}
> <plugin>
> <groupId>org.revapi</groupId>
> <artifactId>revapi-maven-plugin</artifactId>
> <version>0.5.1</version>
> <dependencies>
>   <dependency>
>     <groupId>org.revapi</groupId>
>     <artifactId>revapi-java</artifactId>
>     <version>0.10.1</version>
>   </dependency>
> </dependencies>
> </plugin>
> {code}
> h4. Revapi Maven Plugin
> Docs are [here|http://revapi.org/modules/revapi-maven-plugin/index.html]. 
> After running {{mvn revapi:check}}, it finds a lot. There is a mechanism to 
> suppress findings in a fine-grained way.
> {noformat}
> [ERROR] java.class.removed: class 
> org.apache.logging.log4j.core.async.DaemonThreadFactory: Class was removed.
> [ERROR] java.field.constantValueChanged: field 
> org.apache.logging.log4j.core.layout.PatternLayout.TTCC_CONVERSION_PATTERN: 
> Constant field changed value from '%r [%t] %p %c %x - %m%n' to '%r [%t] %p %c 
> %notEmpty{%x }- %m%n'.
> [ERROR] java.field.removed: field 
> org.apache.logging.log4j.core.appender.rolling.DefaultRolloverStrategy.LOGGER:
>  Field removed from class.
> [ERROR] java.field.removed: field 
> org.apache.logging.log4j.core.util.Constants.UTF_8: Field removed from class.
> [ERROR] java.generics.formalTypeParameterAdded: class 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder: A new formal 
> type parameter added to element: 'B extends 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder<B extends 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder<B>>'.
> [ERROR] java.generics.formalTypeParameterAdded: method 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder 
> org.apache.logging.log4j.core.appender.ConsoleAppender::newBuilder(): A new 
> formal type parameter added to element: 'B extends 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder<B extends 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder<B>>'.
> [ERROR] java.method.addedToInterface: method boolean 
> org.apache.logging.log4j.core.LifeCycle::stop(long, 
> java.util.concurrent.TimeUnit): Method was added to an interface.
> [ERROR] java.method.addedToInterface: method java.lang.String 
> org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder<T 
> extends 
> org.apache.logging.log4j.core.config.Configuration>::toXmlConfiguration(): 
> Method was added to an interface.
> [ERROR] java.method.addedToInterface: method 
> org.apache.logging.log4j.core.LoggerContext 
> org.apache.logging.log4j.core.config.Configuration::getLoggerContext(): 
> Method was added to an interface.
> [ERROR] java.method.addedToInterface: method 
> org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder<T> 
> org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder<T 
> extends 
> org.apache.logging.log4j.core.config.Configuration>::setDestination(java.lang.String):
>  Method was added to an interface.
> [ERROR] java.method.addedToInterface: method 
> org.apache.logging.log4j.spi.ContextData 
> org.apache.logging.log4j.core.LogEvent::getContextData(): Method was added to 
> an interface.
> [ERROR] java.method.addedToInterface: method void 
> org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder<T 
> extends 
> org.apache.logging.log4j.core.config.Configuration>::setLoggerContext(org.apache.logging.log4j.core.LoggerContext):
>  Method was added to an interface.
> [ERROR] java.method.addedToInterface: method void 
> org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder<T 
> extends 
> org.apache.logging.log4j.core.config.Configuration>::writeXmlConfiguration(java.io.OutputStream)
>  throws java.io.IOException: Method was added to an interface.
> [ERROR] java.method.exception.checkedAdded: method java.io.OutputStream 
> org.apache.logging.log4j.core.appender.OutputStreamManager::getOutputStream():
>  Method newly throws checked exceptions: [java.io.IOException].
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.appender.FileManager 
> org.apache.logging.log4j.core.appender.FileManager::getFileManager(java.lang.String,
>  boolean, boolean, boolean, java.lang.String, 
> org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>, int, 
> boolean): The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.appender.RandomAccessFileManager 
> org.apache.logging.log4j.core.appender.RandomAccessFileManager::getFileManager(java.lang.String,
>  boolean, boolean, int, java.lang.String, 
> org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.appender.mom.kafka.KafkaAppender 
> org.apache.logging.log4j.core.appender.mom.kafka.KafkaAppender::createAppender(org.apache.logging.log4j.core.Layout<?
>  extends java.io.Serializable>, org.apache.logging.log4j.core.Filter, 
> java.lang.String, boolean, java.lang.String, 
> org.apache.logging.log4j.core.config.Property[]): The number of parameters of 
> the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.appender.rolling.RollingFileManager 
> org.apache.logging.log4j.core.appender.rolling.RollingFileManager::getFileManager(java.lang.String,
>  java.lang.String, boolean, boolean, 
> org.apache.logging.log4j.core.appender.rolling.TriggeringPolicy, 
> org.apache.logging.log4j.core.appender.rolling.RolloverStrategy, 
> java.lang.String, org.apache.logging.log4j.core.Layout<? extends 
> java.io.Serializable>, int, boolean): The number of parameters of the method 
> have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.appender.rolling.RollingRandomAccessFileManager 
> org.apache.logging.log4j.core.appender.rolling.RollingRandomAccessFileManager::getRollingRandomAccessFileManager(java.lang.String,
>  java.lang.String, boolean, boolean, int, 
> org.apache.logging.log4j.core.appender.rolling.TriggeringPolicy, 
> org.apache.logging.log4j.core.appender.rolling.RolloverStrategy, 
> java.lang.String, org.apache.logging.log4j.core.Layout<? extends 
> java.io.Serializable>): The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.appender.routing.PurgePolicy 
> org.apache.logging.log4j.core.appender.routing.IdlePurgePolicy::createPurgePolicy(java.lang.String,
>  java.lang.String, org.apache.logging.log4j.core.config.Configuration): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.config.Configuration 
> org.apache.logging.log4j.core.config.ConfigurationFactory::getConfiguration(java.lang.String,
>  java.net.URI): The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.config.Configuration 
> org.apache.logging.log4j.core.config.ConfigurationFactory::getConfiguration(java.lang.String,
>  java.net.URI, java.lang.ClassLoader): The number of parameters of the method 
> have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.config.Configuration 
> org.apache.logging.log4j.core.config.ConfigurationFactory::getConfiguration(org.apache.logging.log4j.core.config.ConfigurationSource):
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.config.Configuration 
> org.apache.logging.log4j.core.config.json.JsonConfigurationFactory::getConfiguration(org.apache.logging.log4j.core.config.ConfigurationSource):
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.config.Configuration 
> org.apache.logging.log4j.core.config.xml.XmlConfigurationFactory::getConfiguration(org.apache.logging.log4j.core.config.ConfigurationSource):
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.config.Configuration 
> org.apache.logging.log4j.core.config.yaml.YamlConfigurationFactory::getConfiguration(org.apache.logging.log4j.core.config.ConfigurationSource):
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.config.Configuration 
> org.apache.logging.log4j.core.net.server.AbstractSocketServer.ServerConfigurationFactory::getConfiguration(java.lang.String,
>  java.net.URI): The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.config.properties.PropertiesConfiguration 
> org.apache.logging.log4j.core.config.properties.PropertiesConfigurationFactory::getConfiguration(org.apache.logging.log4j.core.config.ConfigurationSource):
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.layout.AbstractJacksonLayout 
> org.apache.logging.log4j.core.layout.YamlLayout::createLayout(org.apache.logging.log4j.core.config.Configuration,
>  boolean, boolean, java.lang.String, java.lang.String, 
> java.nio.charset.Charset): The number of parameters of the method have 
> changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.layout.JsonLayout 
> org.apache.logging.log4j.core.layout.JsonLayout::createLayout(org.apache.logging.log4j.core.config.Configuration,
>  boolean, boolean, boolean, boolean, boolean, boolean, java.lang.String, 
> java.lang.String, java.nio.charset.Charset): The number of parameters of the 
> method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.layout.XmlLayout 
> org.apache.logging.log4j.core.layout.XmlLayout::createLayout(boolean, 
> boolean, boolean, boolean, java.nio.charset.Charset): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.net.AbstractSocketManager 
> org.apache.logging.log4j.core.appender.SocketAppender::createSocketManager(java.lang.String,
>  org.apache.logging.log4j.core.net.Protocol, java.lang.String, int, int, 
> org.apache.logging.log4j.core.net.ssl.SslConfiguration, int, boolean, 
> org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.net.DatagramSocketManager 
> org.apache.logging.log4j.core.net.DatagramSocketManager::getSocketManager(java.lang.String,
>  int, org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>): 
> The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.net.SslSocketManager 
> org.apache.logging.log4j.core.net.SslSocketManager::getSocketManager(org.apache.logging.log4j.core.net.ssl.SslConfiguration,
>  java.lang.String, int, int, int, boolean, 
> org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method 
> org.apache.logging.log4j.core.net.TcpSocketManager 
> org.apache.logging.log4j.core.net.TcpSocketManager::getSocketManager(java.lang.String,
>  int, int, int, boolean, org.apache.logging.log4j.core.Layout<? extends 
> java.io.Serializable>): The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.LoggerContext::stop(): The number of parameters 
> of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.AbstractManager::<init>(java.lang.String):
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.AbstractManager::releaseSub(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender<M extends 
> org.apache.logging.log4j.core.appender.OutputStreamManager>::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.AbstractWriterAppender<M extends 
> org.apache.logging.log4j.core.appender.WriterManager>::stop(): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.AsyncAppender::stop(): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.FileAppender::stop(): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.MemoryMappedFileAppender::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.OutputStreamManager::releaseSub(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.RandomAccessFileAppender::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.RandomAccessFileManager::<init>(java.io.RandomAccessFile,
>  java.lang.String, java.io.OutputStream, int, java.lang.String, 
> org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>, 
> boolean): The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.RollingFileAppender::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender::stop():
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.SocketAppender::stop(): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.WriterManager::releaseSub(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender<T extends 
> org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager>::stop(): 
> The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager::releaseSub():
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.mom.JmsAppender::stop(): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.mom.JmsManager::releaseSub(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.mom.jeromq.JeroMqAppender::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.mom.jeromq.JeroMqManager::releaseSub():
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.mom.kafka.KafkaAppender::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.mom.kafka.KafkaManager::<init>(java.lang.String,
>  java.lang.String, org.apache.logging.log4j.core.config.Property[]): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.mom.kafka.KafkaManager::releaseSub(): 
> The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.rolling.RollingRandomAccessFileManager::<init>(java.io.RandomAccessFile,
>  java.lang.String, java.lang.String, java.io.OutputStream, boolean, boolean, 
> int, long, long, 
> org.apache.logging.log4j.core.appender.rolling.TriggeringPolicy, 
> org.apache.logging.log4j.core.appender.rolling.RolloverStrategy, 
> java.lang.String, org.apache.logging.log4j.core.Layout<? extends 
> java.io.Serializable>, boolean): The number of parameters of the method have 
> changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.routing.IdlePurgePolicy::<init>(long, 
> org.apache.logging.log4j.core.config.ConfigurationScheduler): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.routing.IdlePurgePolicy::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.appender.routing.RoutingAppender::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.async.AsyncLoggerConfig::stop(): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.async.AsyncLoggerContext::stop(): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.async.RingBufferLogEventTranslator::setBasicValues(org.apache.logging.log4j.core.async.AsyncLogger,
>  java.lang.String, org.apache.logging.log4j.Marker, java.lang.String, 
> org.apache.logging.log4j.Level, org.apache.logging.log4j.message.Message, 
> java.lang.Throwable, java.util.Map<java.lang.String, java.lang.String>, 
> org.apache.logging.log4j.ThreadContext.ContextStack, 
> java.lang.StackTraceElement, long, long): The number of parameters of the 
> method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.config.AbstractConfiguration::<init>(org.apache.logging.log4j.core.config.ConfigurationSource):
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.config.AbstractConfiguration::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.config.ConfigurationScheduler::stop(): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration::<init>(org.apache.logging.log4j.core.config.ConfigurationSource,
>  org.apache.logging.log4j.core.config.builder.api.Component): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.config.json.JsonConfiguration::<init>(org.apache.logging.log4j.core.config.ConfigurationSource):
>  The number ofparameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.config.properties.PropertiesConfiguration::<init>(org.apache.logging.log4j.core.config.ConfigurationSource,
>  org.apache.logging.log4j.core.config.builder.api.Component): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.config.xml.XmlConfiguration::<init>(org.apache.logging.log4j.core.config.ConfigurationSource):
>  The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.config.yaml.YamlConfiguration::<init>(org.apache.logging.log4j.core.config.ConfigurationSource):
>  The number ofparameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.filter.AbstractFilterable::stop(): The number 
> of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.filter.CompositeFilter::stop(): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.impl.ThrowableFormatOptions::<init>(int, 
> java.lang.String, java.util.List<java.lang.String>): The number of parameters 
> of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.jackson.Log4jJsonObjectMapper::<init>(boolean): 
> The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.jackson.Log4jYamlObjectMapper::<init>(boolean): 
> The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.layout.JsonLayout::<init>(org.apache.logging.log4j.core.config.Configuration,
>  boolean, boolean, boolean, boolean, boolean, boolean, java.lang.String, 
> java.lang.String, java.nio.charset.Charset): The number of parameters of the 
> method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.layout.XmlLayout::<init>(boolean, boolean, 
> boolean, boolean, java.nio.charset.Charset): The number of parameters of the 
> method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.layout.YamlLayout::<init>(org.apache.logging.log4j.core.config.Configuration,
>  boolean, boolean, boolean, boolean, boolean, java.lang.String, 
> java.lang.String, java.nio.charset.Charset): The number of parameters of the 
> method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.net.AbstractSocketManager::<init>(java.lang.String,
>  java.io.OutputStream, java.net.InetAddress, java.lang.String, int, 
> org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>, 
> boolean): The number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.net.DatagramSocketManager::<init>(java.lang.String,
>  java.io.OutputStream, java.net.InetAddress, java.lang.String, int, 
> org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.net.JndiManager::releaseSub(): The number of 
> parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.net.SslSocketManager::<init>(java.lang.String, 
> java.io.OutputStream, java.net.Socket, 
> org.apache.logging.log4j.core.net.ssl.SslConfiguration, java.net.InetAddress, 
> java.lang.String, int, int, int, boolean, 
> org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.net.TcpSocketManager::<init>(java.lang.String, 
> java.io.OutputStream, java.net.Socket, java.net.InetAddress, 
> java.lang.String, int, int, int, boolean, 
> org.apache.logging.log4j.core.Layout<? extends java.io.Serializable>): The 
> number of parameters of the method have changed.
> [ERROR] java.method.numberOfParametersChanged: method void 
> org.apache.logging.log4j.core.util.WatchManager::stop(): The number of 
> parameters of the method have changed.
> [ERROR] java.method.parameterTypeChanged: method parameter void 
> org.apache.logging.log4j.core.async.RingBufferLogEvent::setValues(org.apache.logging.log4j.core.async.AsyncLogger,
>  java.lang.String, org.apache.logging.log4j.Marker, java.lang.String, 
> org.apache.logging.log4j.Level, org.apache.logging.log4j.message.Message, 
> java.lang.Throwable, ===java.util.Map<java.lang.String, 
> java.lang.String>===,org.apache.logging.log4j.ThreadContext.ContextStack, 
> long, java.lang.String, int, java.lang.StackTraceElement, long, long): The 
> type of the parameter changed from 'java.util.Map<java.lang.String, 
> java.lang.String>' to 'org.apache.logging.log4j.spi.MutableContextData'.
> [ERROR] java.method.parameterTypeChanged: method parameter void 
> org.apache.logging.log4j.core.util.Closer::closeSilently(===java.io.Closeable===):
>  The type of the parameter changed from 'java.io.Closeable' to 
> 'java.sql.Statement'.
> [ERROR] java.method.parameterTypeChanged: method parameter void 
> org.apache.logging.log4j.core.util.Closer::closeSilently(===java.sql.Statement===):
>  The type of the parameter changed from 'java.sql.Statement' to 
> 'java.io.Closeable'.
> [ERROR] java.method.removed: method <T> T 
> org.apache.logging.log4j.core.util.Assert::requireNonNull(T, 
> java.lang.String): Method was removed.
> [ERROR] java.method.removed: method java.lang.Class<?> 
> org.apache.logging.log4j.core.util.Loader::loadClass(java.lang.String) throws 
> java.lang.ClassNotFoundException: Method was removed.
> [ERROR] java.method.removed: method java.util.List<java.lang.String> 
> org.apache.logging.log4j.core.impl.ThrowableFormatOptions::getPackages(): 
> Method was removed.
> [ERROR] java.method.removed: method 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder::setFilter(org.apache.logging.log4j.core.Filter):
>  Method was removed.
> [ERROR] java.method.removed: method 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder::setIgnoreExceptions(boolean):
>  Methodwas removed.
> [ERROR] java.method.removed: method 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder::setLayout(org.apache.logging.log4j.core.Layout<?
>  extends java.io.Serializable>): Method was removed.
> [ERROR] java.method.removed: method 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder::setName(java.lang.String):
>  Method was removed.
> [ERROR] java.method.removed: method void 
> org.apache.logging.log4j.core.async.RingBufferLogEvent::mergePropertiesIntoContextMap(java.util.Map<org.apache.logging.log4j.core.config.Property,
>  java.lang.Boolean>, org.apache.logging.log4j.core.lookup.StrSubstitutor): 
> Method was removed.
> [ERROR] java.method.removed: method void 
> org.apache.logging.log4j.core.impl.MutableLogEvent::setContextMap(java.util.Map<java.lang.String,
>  java.lang.String>): Method was removed.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.LoggerContext::stop(): The return type changed 
> from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.AbstractManager::releaseSub(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender<M extends 
> org.apache.logging.log4j.core.appender.OutputStreamManager>::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.AbstractWriterAppender<M extends 
> org.apache.logging.log4j.core.appender.WriterManager>::stop(): The return 
> type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.AsyncAppender::stop(): The return type 
> changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.FileAppender::stop(): The return type 
> changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.MemoryMappedFileAppender::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.OutputStreamManager::releaseSub(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.RandomAccessFileAppender::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.RollingFileAppender::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender::stop():
>  The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.SocketAppender::stop(): The return 
> type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.WriterManager::releaseSub(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender<T extends 
> org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager>::stop(): 
> The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager::commitAndClose():
>  The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager::releaseSub():
>  The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager::shutdown():
>  The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager::shutdownInternal()
>  throws java.lang.Exception: The return type changed from 'void' to  
> 'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager::commitAndClose():
>  The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager::shutdownInternal():
>  The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.db.jpa.JpaDatabaseManager::commitAndClose():
>  The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.db.jpa.JpaDatabaseManager::shutdownInternal():
>  The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.mom.JmsAppender::stop(): The return 
> type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.mom.JmsManager::releaseSub(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.mom.jeromq.JeroMqAppender::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.mom.jeromq.JeroMqManager::releaseSub():
>  The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.mom.kafka.KafkaAppender::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.mom.kafka.KafkaManager::releaseSub(): 
> The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.routing.IdlePurgePolicy::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.appender.routing.RoutingAppender::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.async.AsyncLoggerConfig::stop(): The return 
> type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.async.AsyncLoggerContext::stop(): The return 
> type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.config.AbstractConfiguration::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.config.ConfigurationScheduler::stop(): The 
> return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.filter.AbstractFilterable::stop(): The return 
> type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.filter.CompositeFilter::stop(): The return type 
> changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.net.JndiManager::releaseSub(): The return type 
> changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.util.Closer::closeSilently(java.sql.Statement): 
> The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.util.JndiCloser::closeSilently(javax.naming.Context):
>  The return type changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeChanged: method void 
> org.apache.logging.log4j.core.util.WatchManager::stop(): The return type 
> changed from 'void' to  'boolean'.
> [ERROR] java.method.returnTypeTypeParametersChanged: method 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder::setDirect(boolean):
>  The return type changed from 
> 'org.apache.logging.log4j.core.appender.ConsoleAppender.Builder' to 'B 
> extends org.apache.logging.log4j.core.appender.ConsoleAppender.Builder<B>'.
> [ERROR] java.method.returnTypeTypeParametersChanged: method 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder::setFollow(boolean):
>  The return type changed from 
> 'org.apache.logging.log4j.core.appender.ConsoleAppender.Builder' to 'B 
> extends org.apache.logging.log4j.core.appender.ConsoleAppender.Builder<B>'.
> [ERROR] java.method.returnTypeTypeParametersChanged: method 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder::setTarget(org.apache.logging.log4j.core.appender.ConsoleAppender.Target):
>  The return type changed from 
> 'org.apache.logging.log4j.core.appender.ConsoleAppender.Builder' to 'B 
> extends org.apache.logging.log4j.core.appender.ConsoleAppender.Builder<B>'.
> [ERROR] java.method.returnTypeTypeParametersChanged: method 
> org.apache.logging.log4j.core.appender.ConsoleAppender.Builder 
> org.apache.logging.log4j.core.appender.ConsoleAppender::newBuilder(): The 
> return type changed from 
> 'org.apache.logging.log4j.core.appender.ConsoleAppender.Builder' to 'B 
> extends org.apache.logging.log4j.core.appender.ConsoleAppender.Builder<B>'.
> [ERROR] java.method.visibilityReduced: method void 
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender<M extends 
> org.apache.logging.log4j.core.appender.OutputStreamManager>::stop(): 
> visibility reduced
> [ERROR] java.method.visibilityReduced: method void 
> org.apache.logging.log4j.core.filter.AbstractFilterable::stop(): visibility 
> reduced
> [ERROR] java.method.visibilityReduced: method void 
> org.apache.logging.log4j.core.util.NullOutputStream::<init>(): visibility 
> reduced
> {noformat}



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