Andrew Janke created MCOMPILER-415:
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Summary: NullPointerException from javac when compiling
AntlrWorks-Jank
Key: MCOMPILER-415
URL: https://issues.apache.org/jira/browse/MCOMPILER-415
Project: Maven Compiler Plugin
Issue Type: Bug
Affects Versions: 3.8.1
Environment: macOS 10.14.6, iMac Pro, AdoptOpenJDK 9, OpenJDK 11.0.2,
AdoptOpenJDK 13.0.2
Reporter: Andrew Janke
Attachments: antlrworks-jank-mvn-compile-NPE.log
I'm working on a project called AntlrWorks-Jank, an attempt to revive the
defunct ANTLRWorks application. https://github.com/apjanke/antlrworks2-jank
When compiling the latest work-in-progress version of my code, I'm getting a
NullPointerException apparently raised inside the javac code when it's called
by the Maven Compiler Plugin.
{code:java}
[antlrworks-jank] $ mvn -e compile
[INFO] Error stacktraces are turned on.
[...]
[INFO] works-editor-antlr4 ................................ FAILURE [ 1.026 s]
[INFO] antlr-works-editor ................................. SKIPPED
[INFO] tvl-editor-whitespace .............................. SKIPPED
[INFO] works-editor-antlr3 ................................ SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.028 s
[INFO] Finished at: 2020-05-08T03:01:54-04:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on
project works-editor-antlr4: Fatal error compiling: CompilerException:
NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on
project works-editor-antlr4: Fatal error compiling
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:215)
[...]
Caused by: java.lang.NullPointerException
at com.sun.tools.javac.main.JavaCompiler.readSourceFile
(JavaCompiler.java:825)
at
com.sun.tools.javac.processing.JavacProcessingEnvironment$ImplicitCompleter.complete
(JavacProcessingEnvironment.java:1510)
at com.sun.tools.javac.code.Symbol.complete (Symbol.java:633)
at com.sun.tools.javac.code.Symbol$ClassSymbol.complete (Symbol.java:1314)
at com.sun.tools.javac.code.Type$ClassType.complete (Type.java:1139)
at com.sun.tools.javac.code.Type$ClassType.getTypeArguments (Type.java:1065)
at com.sun.tools.javac.code.Printer.visitClassType (Printer.java:237)
at com.sun.tools.javac.code.Printer.visitClassType (Printer.java:52)
at com.sun.tools.javac.code.Type$ClassType.accept (Type.java:992)
at com.sun.tools.javac.code.Printer.visit (Printer.java:136)
at com.sun.tools.javac.util.AbstractDiagnosticFormatter.formatArgument
(AbstractDiagnosticFormatter.java:197)
at com.sun.tools.javac.util.AbstractDiagnosticFormatter.formatArguments
(AbstractDiagnosticFormatter.java:165)
at com.sun.tools.javac.util.BasicDiagnosticFormatter.formatMessage
(BasicDiagnosticFormatter.java:111)
at com.sun.tools.javac.util.BasicDiagnosticFormatter.formatMessage
(BasicDiagnosticFormatter.java:67)
at com.sun.tools.javac.util.AbstractDiagnosticFormatter.formatArgument
(AbstractDiagnosticFormatter.java:183)
at com.sun.tools.javac.util.AbstractDiagnosticFormatter.formatArguments
(AbstractDiagnosticFormatter.java:165)
at com.sun.tools.javac.util.BasicDiagnosticFormatter.formatMessage
(BasicDiagnosticFormatter.java:111)
at com.sun.tools.javac.util.BasicDiagnosticFormatter.formatMessage
(BasicDiagnosticFormatter.java:67)
at com.sun.tools.javac.util.JCDiagnostic.getMessage (JCDiagnostic.java:771)
at
com.sun.tools.javac.api.ClientCodeWrapper$DiagnosticSourceUnwrapper.getMessage
(ClientCodeWrapper.java:799)
at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess
(JavaxToolsCompiler.java:149)
at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile
(JavacCompiler.java:169)
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute
(AbstractCompilerMojo.java:785)
at org.apache.maven.plugin.compiler.CompilerMojo.execute
(CompilerMojo.java:129)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo
(DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute
(MojoExecutor.java:156)
{code}
The full code to reproduce is on the NPE-during-compile tag in that repo:
https://github.com/apjanke/antlrworks2-jank/tree/NPE-during-compile.
I *think* I'm running the latest 3.8.1 version of maven-compiler-plugin, since
I'm not specifying a version for it in my POMs. Seems to happen with Java 9,
11, and 13 (which I'm selecting by setting the $JAVA_HOME environment variable
before running `mvn -e compile`).
Would this be a bug in maven-compiler-plugin? Or actually a bug in javac? Or
something else?
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