Original issue created by raphael.andre.bauer on 2014-03-18 at 09:24 PM

Short description

We are using error-prone (latest 1.1.1) in some of our open source maven projects. We just tried to build our project with the final fancy 1.8.0 JDK, but we are getting an error. Removing error prone "fixes" the issue. It also works perfectly fine with the old series 7 JDK.

Thanks for your efforts and looking into this!

The relevant error message is

java.lang.ClassCastException: com.sun.tools.javac.main.Main$Result cannot be cast to java.lang.Integer

coming from:
org.codehaus.plexus.compiler.javac.JavacCompiler.compileInProcess(JavacCompiler.java:538)

(Full stack trace below).

My environment

Apache Maven 3.2.1 (ea8b2b07643dbb1b84b6d16e1f08391b666bc1e9; 2014-02-14T18:37:52+01:00)
Maven home: /Users/user/applications/apache-maven
Java version: 1.8.0, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.7.5", arch: "x86_64", family: "mac"

error-prone libraries and compiler versions

<plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.1</version>
                    <configuration>
                        <source>1.7</source>
                        <target>1.7</target>
                        <compilerId>javac-with-errorprone</compilerId>
                        <forceJavacCompilerUse>true</forceJavacCompilerUse>
                    </configuration>
                    <dependencies>
                        <dependency>
                            <groupId>com.google.errorprone</groupId>
                            <artifactId>error_prone_core</artifactId>
                            <version>1.1.1</version>
                        </dependency>
                        <dependency>
                            <groupId>org.codehaus.plexus</groupId>
                            <artifactId>plexus-compiler-javac</artifactId>
                            <version>2.3</version>
                        </dependency>
                        <dependency>
                            <groupId>org.codehaus.plexus</groupId>
                            <artifactId>plexus-compiler-javac-errorprone</artifactId>
                            <version>2.3</version>
                        </dependency>
                    </dependencies>
                </plugin>

Project to reproduce problem:

Open source project at https://github.com/ninjaframework/ninja - tag ninja-3.1.2

(Full stack trace)

Caused by: org.apache.maven.plugin.MojoExecutionException: Fatal error compiling
    at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:796)
    at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:129)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:133)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
    ... 19 more
Caused by: java.lang.ClassCastException: com.sun.tools.javac.main.Main$Result cannot be cast to java.lang.Integer
    at org.codehaus.plexus.compiler.javac.errorprone.JavacCompilerWithErrorProne.compileInProcessWithProperClassloader(JavacCompilerWithErrorProne.java:180)
    at org.codehaus.plexus.compiler.javac.JavacCompiler.compileInProcess(JavacCompiler.java:538)
    at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:174)
    at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:785)
    ... 22 more