Holger Mense created MCOMPILER-512:
--------------------------------------

             Summary: Defining maven.compiler.release as empty string ends with 
NumberFormatException in testCompileMojo
                 Key: MCOMPILER-512
                 URL: https://issues.apache.org/jira/browse/MCOMPILER-512
             Project: Maven Compiler Plugin
          Issue Type: Bug
    Affects Versions: 3.10.1
            Reporter: Holger Mense
         Attachments: showcase-1.zip

When {{maven.compiler.release}} is set to an empty string, a 
{{NumberFormatException}} is thrown when trying to compile tests.

See attached showcase.zip for a minimal example. Calling {{mvn test}} in 
subdirectory {{HelloWorld/}}, leads to the following:
{noformat}
[HelloWorld/] $ mvn clean test -e
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO]
[INFO] -------------------------< example:helloworld >-------------------------
[INFO] Building helloworld 1.0.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ helloworld ---
[INFO] Deleting C:\DATA\temp\maven-compiler-issue\HelloWorld\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ 
helloworld ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, 
i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory 
C:\DATA\temp\maven-compiler-issue\HelloWorld\src\main\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.10.1:compile (default-compile) @ helloworld 
---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. 
build is platform dependent!
[INFO] Compiling 1 source file to 
C:\DATA\temp\maven-compiler-issue\HelloWorld\target\classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ 
helloworld ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, 
i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory 
C:\DATA\temp\maven-compiler-issue\HelloWorld\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.10.1:testCompile (default-testCompile) @ 
helloworld ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.690 s
[INFO] Finished at: 2022-11-30T16:05:57+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal 
org.apache.maven.plugins:maven-compiler-plugin:3.10.1:testCompile 
(default-testCompile) on project helloworld: Execution default-testCompile of 
goal org.apache.maven.plugins:maven-compiler-plugin:3.10.1:testCompile failed: 
For input string: "" -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal 
org.apache.maven.plugins:maven-compiler-plugin:3.10.1:testCompile 
(default-testCompile) on project helloworld: Execution default-testCompile of 
goal org.apache.maven.plugins:maven-compiler-plugin:3.10.1:testCompile failed: 
For input string: ""
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 
(MojoExecutor.java:375)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute 
(MojoExecutor.java:351)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:171)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:163)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:81)
    at 
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
 (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
(NativeMethodAccessorImpl.java:77)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:568)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
(Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
(Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
(Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
(Launcher.java:347)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution 
default-testCompile of goal 
org.apache.maven.plugins:maven-compiler-plugin:3.10.1:testCompile failed: For 
input string: ""
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo 
(DefaultBuildPluginManager.java:148)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 
(MojoExecutor.java:370)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute 
(MojoExecutor.java:351)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:171)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:163)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:81)
    at 
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
 (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
(NativeMethodAccessorImpl.java:77)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:568)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
(Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
(Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
(Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
(Launcher.java:347)
Caused by: java.lang.NumberFormatException: For input string: ""
    at java.lang.NumberFormatException.forInputString 
(NumberFormatException.java:67)
    at java.lang.Integer.parseInt (Integer.java:678)
    at java.lang.Integer.valueOf (Integer.java:999)
    at org.apache.maven.plugin.compiler.TestCompilerMojo.preparePaths 
(TestCompilerMojo.java:309)
    at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute 
(AbstractCompilerMojo.java:864)
    at org.apache.maven.plugin.compiler.TestCompilerMojo.execute 
(TestCompilerMojo.java:183)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo 
(DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 
(MojoExecutor.java:370)
    at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute 
(MojoExecutor.java:351)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:171)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:163)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:81)
    at 
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
 (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:294)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:960)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
(NativeMethodAccessorImpl.java:77)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:568)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
(Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
(Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
(Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
(Launcher.java:347)
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please 
read the following articles:
[ERROR] [Help 1] 
http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException{noformat}



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