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https://issues.apache.org/jira/browse/LOG4J2-3437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17507598#comment-17507598
 ] 

Pooja Pandey edited comment on LOG4J2-3437 at 3/16/22, 1:24 PM:
----------------------------------------------------------------

Thanks [~pkarwasz]. I get below runtime error with this code,

 

java.lang.NullPointerException
    at java.util.Objects.requireNonNull(Objects.java:203)
    at java.util.Arrays$ArrayList.<init>(Arrays.java:3813)
    at java.util.Arrays.asList(Arrays.java:3800)
    at 
org.apache.logging.log4j.core.config.LoggerConfig.getLevelAndRefs(LoggerConfig.java:951)
    at 
org.apache.logging.log4j.core.config.LoggerConfig$Builder.build(LoggerConfig.java:225)
    at logger.TestAppender2.addAppender(TestAppender2.java:624)
    at logger.TestAppender2.setUp(TestAppender2.java:592)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
    at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
    at 
org.junit.internal.runners.statements.RunBefores.invokeMethod(RunBefores.java:33)
    at 
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
    at 
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at 
org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
    at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
    at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
    at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
    at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
    at 
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at 
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at 
com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
    at 
com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at 
com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:221)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)

Log written to file 
C:\Users\Pooja.Pandey\AppData\Local\Temp\dummyOutput502622014804752235.log

java.lang.NullPointerException
    at java.util.Objects.requireNonNull(Objects.java:203)
    at java.util.Arrays$ArrayList.<init>(Arrays.java:3813)
    at java.util.Arrays.asList(Arrays.java:3800)
    at 
org.apache.logging.log4j.core.config.LoggerConfig.getLevelAndRefs(LoggerConfig.java:951)
    at 
org.apache.logging.log4j.core.config.LoggerConfig$Builder.build(LoggerConfig.java:225)
    at logger.TestAppender2.addAppender(TestAppender2.java:624)
    at logger.TestAppender2.setUp(TestAppender2.java:592)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
    at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
    at 
org.junit.internal.runners.statements.RunBefores.invokeMethod(RunBefores.java:33)
    at 
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
    at 
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at 
org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
    at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
    at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
    at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
    at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
    at 
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at 
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at 
com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
    at 
com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at 
com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:221)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)


was (Author: JIRAUSER285751):
Thanks [~pkarwasz]. 

> Log4j 1.x bridge Request to support programmatically configuring Log4j.
> -----------------------------------------------------------------------
>
>                 Key: LOG4J2-3437
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-3437
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Log4j 1.2 bridge
>    Affects Versions: 2.17.2
>            Reporter: Pooja Pandey
>            Priority: Major
>
> As per log4j migration documentation 
> ([https://logging.apache.org/log4j/2.x/manual/migration.html),|https://logging.apache.org/log4j/2.x/manual/migration.html)]
>  I understand that currently log4j 1.x bridge 2.17.2 doesn't support 
> programmatically configuring log4j appenders.
> *#### Limitations of the Log4j 1.x bridge*
>  # *They must not programmatically configure Log4j.*
>  
> In our application, we have a requirement where we need to add many 
> FileAppender programmatically with various log threshold values.
>  
> Hoping to get this feature supported in future versions for log4j1.x bridge.
>  



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