Class not found warnings and errors when analysing bytecode

ObjectMastery

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Jan 9, 2017, 10:58:34 PM1/9/17

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Hi everyone,

I've been having a few warnings and errors spat out by the Sonar Scanner. For quick context, I have a Java/Scala project based on the Play Framework v2.5.3 that I am scanning with bytecode analysis.

I am getting an awful lot of "Class not found" warnings and the occasional error spat out by the scanner. Below are the four different warnings I see a lot of:


          
            WARN: Class not found:
              scala.Predef$$less
            
  WARN: Class not found:
              scala.Predef$$less$colon

    WARN: Class not found:
              <package>.views.html.<viewname>_Scope0$<viewname>_Scope1

    WARN: Class not found:
              play.api.mvc.RequestExtractors$

I'm seeing a lot of the first three kinds of warnings, but I don't think they're creating false negatives. From looking around on GitHub, Sonar's issue tracker and here, I gather that these warnings are okay as long as analysis doesn't break.
Some related discussions and issues:

Unfortunately, it does look like I am getting an error to do with the RequestExtractors. I'm seeing that after that particular warning comes up, I get an exception like this:


          ERROR: Unable to create symbol
              table for : /path/to/project/app/controllers/Assets.java

              java.lang.IllegalStateException: Innerclass: RequestExtractors$ and classSymbol: RequestExtractors are not the same.

                      at com.google.common.base.Preconditions.checkState(Preconditions.java:174) ~[guava-19.0.jar:na]

                      at org.sonar.java.resolve.BytecodeVisitor.defineInnerClass(BytecodeVisitor.java:166) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.BytecodeVisitor.visitInnerClass(BytecodeVisitor.java:148) ~[java-frontend-4.0.jar:na]

                      at org.objectweb.asm.ClassReader.accept(ClassReader.java:679) ~[asm-debug-all-5.0.3.jar:5.0.3]

                      at org.objectweb.asm.ClassReader.accept(ClassReader.java:506) ~[asm-debug-all-5.0.3.jar:5.0.3]

                      at org.sonar.java.resolve.BytecodeCompleter.complete(BytecodeCompleter.java:100) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.JavaSymbol.complete(JavaSymbol.java:111) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.JavaType.getSymbol(JavaType.java:75) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.Resolve.findMethod(Resolve.java:434) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.Resolve.findMethod(Resolve.java:420) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.Resolve.findMethod(Resolve.java:457) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.Resolve.findMethod(Resolve.java:420) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.Resolve.findMethod(Resolve.java:457) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.Resolve.findMethod(Resolve.java:420) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.Resolve.findMethod(Resolve.java:449) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.Resolve.findMethod(Resolve.java:420) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.Resolve.findMethod(Resolve.java:449) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.Resolve.findMethod(Resolve.java:416) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.TypeAndReferenceSolver.resolveMethodSymbol(TypeAndReferenceSolver.java:295) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.TypeAndReferenceSolver.visitMethodInvocation(TypeAndReferenceSolver.java:225) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.model.expression.MethodInvocationTreeImpl.accept(MethodInvocationTreeImpl.java:82) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:43) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.visitReturnStatement(BaseTreeVisitor.java:173) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.TypeAndReferenceSolver.visitReturnStatement(TypeAndReferenceSolver.java:501) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.model.statement.ReturnStatementTreeImpl.accept(ReturnStatementTreeImpl.java:69) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:43) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:37) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.visitBlock(BaseTreeVisitor.java:85) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.model.statement.BlockTreeImpl.accept(BlockTreeImpl.java:77) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:43) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.TypeAndReferenceSolver.visitMethod(TypeAndReferenceSolver.java:130) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.model.declaration.MethodTreeImpl.accept(MethodTreeImpl.java:218) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:43) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:37) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.TypeAndReferenceSolver.visitClass(TypeAndReferenceSolver.java:139) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.model.declaration.ClassTreeImpl.accept(ClassTreeImpl.java:198) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:43) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.scan(BaseTreeVisitor.java:37) ~[java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.api.tree.BaseTreeVisitor.visitCompilationUnit(BaseTreeVisitor.java:55) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.resolve.SemanticModel.createFor(SemanticModel.java:63) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.model.VisitorsBridge.visitFile(VisitorsBridge.java:107) ~[java-frontend-4.0.jar:na]

                      at org.sonar.java.ast.JavaAstScanner.simpleScan(JavaAstScanner.java:84) [java-frontend-4.0.jar:na]

                      at org.sonar.java.ast.JavaAstScanner.scan(JavaAstScanner.java:67) [java-frontend-4.0.jar:na]

                      at org.sonar.java.JavaSquid.scanSources(JavaSquid.java:133) [java-frontend-4.0.jar:na]

                      at org.sonar.java.JavaSquid.scan(JavaSquid.java:126) [java-frontend-4.0.jar:na]

                      at org.sonar.plugins.java.JavaSquidSensor.execute(JavaSquidSensor.java:93) [sonar-java-plugin-4.0.jar:na]

                      at org.sonar.scanner.sensor.SensorWrapper.analyse(SensorWrapper.java:53) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.scanner.phases.SensorsExecutor.executeSensor(SensorsExecutor.java:57) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.scanner.phases.SensorsExecutor.execute(SensorsExecutor.java:49) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.scanner.phases.AbstractPhaseExecutor.execute(AbstractPhaseExecutor.java:78) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:184) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:142) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:127) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:241) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:236) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:226) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:142) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:127) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.scanner.task.ScanTask.execute(ScanTask.java:47) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.scanner.task.TaskContainer.doAfterStart(TaskContainer.java:86) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:142) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:127) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.scanner.bootstrap.GlobalContainer.executeTask(GlobalContainer.java:115) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonar.batch.bootstrapper.Batch.executeTask(Batch.java:118) [sonar-scanner-engine-shaded-6.0.jar:na]

                      at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:62) [sonar-scanner-api-batch4845319377614354925.jar:na]

                      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_92]

                      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_92]

                      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_92]

                      at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_92]

                      at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60) [sonar-scanner-cli-2.6.1.jar:na]

                      at com.sun.proxy.$Proxy0.execute(Unknown Source) [na:na]

                      at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:240) [sonar-scanner-cli-2.6.1.jar:na]

                      at org.sonarsource.scanner.api.EmbeddedScanner.runAnalysis(EmbeddedScanner.java:151) [sonar-scanner-cli-2.6.1.jar:na]

                      at org.sonarsource.scanner.cli.Main.runAnalysis(Main.java:110) [sonar-scanner-cli-2.6.1.jar:na]

                      at org.sonarsource.scanner.cli.Main.execute(Main.java:72) [sonar-scanner-cli-2.6.1.jar:na]

                      at org.sonarsource.scanner.cli.Main.main(Main.java:60) [sonar-scanner-cli-2.6.1.jar:na]

The exception doesn't stop the scanner from processing all files, but it does prevent the scanner from processing the file the exception occurred in. I tested by putting in a few lines of code into an affected file that I knew would be marked as issues and they were not marked as issues by the scanner.

I've managed to make an example SBT project that causes the SonarJava analysis to fail in the same way, here:

https://github.com/objectmastery/sonarjava-error

To end on a question, what's the next step in getting this fixed?

Thanks!

ObjectMastery

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Jan 9, 2017, 11:06:59 PM1/9/17

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Forgot to mention, I'm using SonarQube v6.0 and SonarJava v4.3.0.7717

Nicolas Peru

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Jan 10, 2017, 2:56:43 AM1/10/17

to ObjectMastery, SonarQube

Hi,

This is a known issue with scala generated bytecode where the analyzer do no handle that properly : A pull request was made for this one but it needs works : https://github.com/SonarSource/sonar-java/pull/582

Would you be able to create a small sample project reproducing the issue so we can investigate it more properly ?

Thanks.

Le mar. 10 janv. 2017 à 05:07, ObjectMastery <spiltc...@gmail.com> a écrit :

Forgot to mention, I'm using SonarQube v6.0 and SonarJava v4.3.0.7717

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Nicolas Peru

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Jan 10, 2017, 9:28:09 AM1/10/17

to ObjectMastery, SonarQube

Oups, did not see your reproducer. Sorry for that. I shall have a look.

Cheers,

Nicolas Peru

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Jan 11, 2017, 11:00:26 AM1/11/17

to ObjectMastery, SonarQube

Hi,

Thanks for the reproducer, helped a lot to pinpoint the issue and handle it in a general way.

Ticket created to handle this : https://jira.sonarsource.com/browse/SONARJAVA-2043

Not related to scala directly but scala compiler reveals the problem.

Cheers,

ObjectMastery

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Jan 11, 2017, 5:39:39 PM1/11/17

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Hi,

That's excellent news! I'm glad my reproduction of the issue helped out.

Thank you for looking into this.

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