https://bz.apache.org/bugzilla/show_bug.cgi?id=65684
Bug ID: 65684
Summary: NullPointerException in Tomcat's ClassLoaderLogManager
when logging.properties is empty
Product: Tomcat 8
Version: 8.5.71
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: JULI
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ----
Created attachment 38092
--> https://bz.apache.org/bugzilla/attachment.cgi?id=38092&action=edit
Servlet to test the issue.
I am using Tomcat 8.5.71 in a docker container.
I followed the instructions from
https://logging.apache.org/log4j/2.x/log4j-appserver/index.html in order to
setup log4j2 logging configuration.
Additionally, I removed every entry from file conf/loggging.properties and
added a comment "# see: log4j2/conf/log4j2-tomcat.xml" to guide other
maintainer to the log4j2 xml.
In one webapp some business logic is done in a separate thread by using the
join-fork-threadpool. At some point, jdbc comes into play and the
mssql.jdbc:8.4.1 driver asks for a logging property.
static boolean isActivityTraceOn() {
LogManager lm = LogManager.getLogManager();
String activityTrace =
lm.getProperty("com.microsoft.sqlserver.jdbc.traceactivity");
return "on".equalsIgnoreCase(activityTrace);
}
But a NPE is thrown in ClassLoaderLogManager.
2021-11-04T11:08:27,233 ERROR [ForkJoinPool.commonPool-worker-0]
java.lang.NullPointerException: null
at
org.apache.juli.ClassLoaderLogManager.findProperty(ClassLoaderLogManager.java:311)
~[tomcat-juli.jar:8.5.71]
at
org.apache.juli.ClassLoaderLogManager.getProperty(ClassLoaderLogManager.java:291)
~[tomcat-juli.jar:8.5.71]
at com.microsoft.sqlserver.jdbc.Util.isActivityTraceOn(Util.java:778)
~[mssql-jdbc-8.4.1.jre8.jar:?]
I debugged into the method org.apache.juli.ClassLoaderLogManager#findProperty.
In my case, the ContextClassLoader is null and info.props.isEmpty() yields
true.
I would suggest to check if classLoader is null in the if condition in line 310
to avoid the NPE.
My workaround at the moment is to remove the conf/loggging.properties entirely.
Then everything works as expected.
I attached a servlet to test the issue.
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