compileJava: java.lang.NullPointerException: Plugin annotation is null.

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I am trying to run compileJava default task with a huge amount of code. My build.gradle is stil under construction and looks like this:

apply plugin: 'groovy'
apply plugin: 'java'
    // Default configuration profile.
//defaultConfigProperty("conf", "build")
 println "Using configuration profile stored in $rootProject.projectDir/buildProperties.groovy"
apply from: "$rootProject.projectDir/buildProperties.groovy"
  repositories {
    mavenCentral()
          maven {
        url 'http://repo.spring.io/snapshot'
    }
}
  sourceSets {
          test {
          java {
         srcDir 'test/java/integration'
          }
              java {
       srcDir 'test/java/unit'
     }
            groovy {
            srcDir 'test/groovy/acceptance'
        }
            resources {
             srcDir 'test/resources'
        }
               }
          main {
       java {
      srcDir 'src'
       }
    }
}
  dependencies {
    def jodaTimeVersion = "2.3"
 def springVersion = "3.2.9.RELEASE"
 def springLdapVersion = "1.3.1.RELEASE"
 def springSecurityVersion = "3.1.0.RELEASE"
 def springSecurityKerberosVersion = "1.0.0.CI-SNAPSHOT"
 def springSecuritySamlVersion = "1.0.0.RELEASE"
 def hibernateVersion = "4.1.12.Final"
 def hibernateJpaVersion = "1.0.1.Final"
 def hibernateCommonsAnnotationsVersion = "4.0.5.Final"
 def jsonVersion = "20141113"
 def jacksonVersion = "2.4.2"
 def commonsFileUploadVersion = "1.2.2"
 def dozerVersion = "5.3.2.kv.2"
 def oauthVersion = "20100527"
 def oauthProviderVersion = "20100527"
 def slf4jVersion = "1.6.1"
 def log4jVersion = "2.0.2"
   // Groovy tests
    compile 'com.jayway.restassured:rest-assured:2.3.1', {
        exclude group: 'org.codehaus.groovy'
    }
          compile 'org.codehaus.groovy:groovy-all:2.3.0'
          // Date & Time
    compile "joda-time:joda-time:$jodaTimeVersion"
          // Spring Framework
    compile 'org.springframework:spring-aop:3.2.9.RELEASE'
    compile 'org.springframework:spring-aspects:3.2.9.RELEASE'
    compile 'org.springframework:spring-beans:3.2.9.RELEASE'
    compile 'org.springframework:spring-context:3.2.9.RELEASE'
    compile 'org.springframework:spring-context-support:3.2.9.RELEASE'
    compile 'org.springframework:spring-core:3.2.9.RELEASE'
    compile 'org.springframework:spring-expression:3.2.9.RELEASE'
    compile 'org.springframework:spring-instrument:3.2.9.RELEASE'
    compile 'org.springframework:spring-instrument-tomcat:3.2.9.RELEASE'
    compile 'org.springframework:spring-jdbc:3.2.9.RELEASE'
    compile 'org.springframework:spring-orm:3.2.9.RELEASE'
    compile 'org.springframework:spring-tx:3.2.9.RELEASE'
    compile 'org.springframework:spring-web:3.2.9.RELEASE'
    compile 'org.springframework:spring-webmvc:3.2.9.RELEASE'
    compile 'org.springframework:spring-test:3.2.9.RELEASE'
    compile "org.springframework.ldap:spring-ldap-core:$springLdapVersion"
          // Spring Security
    compile "org.springframework.security:spring-security-core:$springSecurityVersion"
    compile "org.springframework.security:spring-security-config:$springSecurityVersion"
    compile "org.springframework.security:spring-security-web:$springSecurityVersion"
    compile "org.springframework.security:spring-security-ldap:$springSecurityVersion"
    compile "org.springframework.security.kerberos:spring-security-kerberos-core:$springSecurityKerberosVersion"
    compile "org.springframework.security.extensions:spring-security-saml2-core:$springSecuritySamlVersion"
          // Hibernate
    compile "org.hibernate:hibernate-core:$hibernateVersion"
    compile "org.hibernate.javax.persistence:hibernate-jpa-2.0-api:$hibernateJpaVersion"
    compile "org.hibernate.common:hibernate-commons-annotations:$hibernateCommonsAnnotationsVersion"
          // Json & Jackson
    compile "org.json:json:$jsonVersion"
    compile "com.fasterxml.jackson.core:jackson-core:$jacksonVersion"
    compile "com.fasterxml.jackson.core:jackson-annotations:$jacksonVersion"
    compile "com.fasterxml.jackson.core:jackson-databind:$jacksonVersion"
    compile "com.fasterxml.jackson.jaxrs:jackson-jaxrs-base:$jacksonVersion"
    compile "com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:$jacksonVersion"
          // Apache Commons
    compile "commons-fileupload:commons-fileupload:$commonsFileUploadVersion"
          // OAuth
    compile "net.oauth.core:oauth:$oauthVersion"
    compile "net.oauth.core:oauth:$oauthProviderVersion"
          // Logging
    compile "org.slf4j:slf4j-api:$slf4jVersion"
    compile "org.slf4j:slf4j-simple:$slf4jVersion"
    compile "org.apache.logging.log4j:log4j-core:$log4jVersion"
    compile "org.apache.logging.log4j:log4j-slf4j-impl:$log4jVersion"
    compile "org.apache.logging.log4j:log4j-api:$log4jVersion"
                      // Jar files
    compile files("$rootProject.projectDir/gradle-lib/dozer-${dozerVersion}.jar")
          testCompile 'junit:junit:4.11'
}
  def defaultConfigProperty(key, defaultValue) {
 if (!project.ext.getProperties().containsKey(key)) {
  project.ext.setProperty(key, defaultValue)
 }
}

If I remove the sourceset main/java then no error at all. What I do it is just running:

gradle compileJava or build

and get this:

16:39:52.339 [DEBUG] [org.gradle.execution.taskgraph.AbstractTaskPlanExecutor] Task worker [Thread[main,5,main]] finished, busy: 4.405 secs, idle: 0.002 secs
16:39:52.344 [ERROR] [org.gradle.BuildExceptionReporter]
 16:39:52.345 [ERROR] [org.gradle.BuildExceptionReporter] FAILURE: Build failed with an exception.
16:39:52.345 [ERROR] [org.gradle.BuildExceptionReporter]
 16:39:52.345 [ERROR] [org.gradle.BuildExceptionReporter] * What went wrong:
16:39:52.346 [ERROR] [org.gradle.BuildExceptionReporter] Execution failed for task ':compileJava'.
16:39:52.346 [ERROR] [org.gradle.BuildExceptionReporter] > java.lang.NullPointerException: Plugin annotation is null.
16:39:52.346 [ERROR] [org.gradle.BuildExceptionReporter]
 16:39:52.347 [ERROR] [org.gradle.BuildExceptionReporter] * Exception is:
16:39:52.348 [ERROR] [org.gradle.BuildExceptionReporter] org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':compileJava'.
16:39:52.348 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
16:39:52.348 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
16:39:52.348 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
16:39:52.349 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64)
16:39:52.349 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
16:39:52.349 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:42)
16:39:52.349 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
16:39:52.350 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
16:39:52.350 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
16:39:52.350 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:305)
16:39:52.350 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(AbstractTaskPlanExecutor.java:79)
16:39:52.350 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:63)
16:39:52.351 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:51)
16:39:52.351 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:23)
16:39:52.351 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:88)
16:39:52.351 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:29)
16:39:52.352 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
16:39:52.352 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
16:39:52.352 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:68)
16:39:52.353 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
16:39:52.353 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
16:39:52.353 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:55)
16:39:52.353 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:149)
16:39:52.354 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:106)
16:39:52.354 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86)
16:39:52.354 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:80)
16:39:52.355 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:33)
16:39:52.355 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:24)
16:39:52.355 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:36)
16:39:52.355 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:26)
16:39:52.356 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:51)
16:39:52.356 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:171)
16:39:52.356 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:237)
16:39:52.357 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:210)
16:39:52.357 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
16:39:52.357 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
16:39:52.358 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:206)
16:39:52.358 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
16:39:52.358 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
16:39:52.358 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
16:39:52.359 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.Main.doAction(Main.java:33)
16:39:52.359 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
16:39:52.359 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54)
16:39:52.359 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
16:39:52.360 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
16:39:52.360 [ERROR] [org.gradle.BuildExceptionReporter] Caused by: java.lang.RuntimeException: java.lang.NullPointerException: Plugin annotation is null.
16:39:52.360 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.main.Main.compile(Main.java:469)
16:39:52.360 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:132)
16:39:52.361 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:42)
16:39:52.361 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:35)
16:39:52.361 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.delegateAndHandleErrors(NormalizingJavaCompiler.java:97)
16:39:52.361 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:50)
16:39:52.362 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:36)
16:39:52.362 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:34)
16:39:52.362 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:25)
16:39:52.362 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.tasks.compile.JavaCompile.performCompilation(JavaCompile.java:158)
16:39:52.362 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:138)
16:39:52.363 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:92)
16:39:52.363 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:63)
16:39:52.363 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$IncrementalTaskAction.doExecute(AnnotationProcessingTaskFactory.java:235)
16:39:52.363 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:211)
16:39:52.364 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$IncrementalTaskAction.execute(AnnotationProcessingTaskFactory.java:222)
16:39:52.364 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:200)
16:39:52.364 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
16:39:52.364 [ERROR] [org.gradle.BuildExceptionReporter]
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
16:39:52.365 [ERROR] [org.gradle.BuildExceptionReporter]
... 44 more
16:39:52.365 [ERROR] [org.gradle.BuildExceptionReporter] Caused by: java.lang.NullPointerException: Plugin annotation is null.
16:39:52.365 [ERROR] [org.gradle.BuildExceptionReporter]
at org.apache.logging.log4j.core.config.plugins.processor.PluginProcessor$PluginElementVisitor.visitType(PluginProcessor.java:129)
16:39:52.365 [ERROR] [org.gradle.BuildExceptionReporter]
at org.apache.logging.log4j.core.config.plugins.processor.PluginProcessor$PluginElementVisitor.visitType(PluginProcessor.java:118)
16:39:52.366 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.code.Symbol$ClassSymbol.accept(Symbol.java:892)
16:39:52.366 [ERROR] [org.gradle.BuildExceptionReporter]
at org.apache.logging.log4j.core.config.plugins.processor.PluginProcessor.collectPlugins(PluginProcessor.java:94)
16:39:52.366 [ERROR] [org.gradle.BuildExceptionReporter]
at org.apache.logging.log4j.core.config.plugins.processor.PluginProcessor.process(PluginProcessor.java:73)
16:39:52.366 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:793)
16:39:52.366 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:722)
16:39:52.367 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1700(JavacProcessingEnvironment.java:97)
16:39:52.367 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1029)
16:39:52.367 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1163)
16:39:52.368 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1108)
16:39:52.368 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:824)
16:39:52.368 [ERROR] [org.gradle.BuildExceptionReporter]
at com.sun.tools.javac.main.Main.compile(Main.java:439)
16:39:52.368 [ERROR] [org.gradle.BuildExceptionReporter]
... 62 more
16:39:52.368 [ERROR] [org.gradle.BuildExceptionReporter]
 16:39:52.369 [LIFECYCLE] [org.gradle.BuildResultLogger]
 16:39:52.369 [LIFECYCLE] [org.gradle.BuildResultLogger] BUILD FAILED
16:39:52.369 [LIFECYCLE] [org.gradle.BuildResultLogger]
 16:39:52.370 [LIFECYCLE] [org.gradle.BuildResultLogger] Total time: 6.957 secs

Any help is much appreciated, very misleading NullPointer… What can happen in the code to get this?

2

At first sight, this looks like a problem with the Log4J annotation processor used by your build (which I’m not familiar with).

3

Thank you!

Yes, I spotted that as well. My code uses the @Plugin annotation to create a custom appender for LOG4J. If I remove that class, it seems to work, but I actually need that class in the build.

Any clues on how to stop gradle from complaining about this? Why is Gradle aware of any annotations in my build?

4

The exception is thrown by the Log4J annotation processor, not by Gradle. Not sure what’s going on. Perhaps the Jar containing the ‘Plugin’ annotation class is missing from the compile class path? Just a guess.

5

I would expect some compilation error from that, maybe not NullPointerException. I don’t have access to my code now. I am just starting a migration from a huge codebase to gradle build and first time round I found this.

Thanks so much for your help, will post here as I figure out what’s exactly going on.