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https://jira.codehaus.org/browse/MCOMPILER-120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=361982#comment-361982
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Benson Margulies commented on MCOMPILER-120:
--------------------------------------------
The problem here is
{code}
<showWarning>true</showWarnings>
{code}
If this is present, the warnings disappear with -Werror.
> Javac compiler plugin doesn't support -Werror
> ---------------------------------------------
>
> Key: MCOMPILER-120
> URL: https://jira.codehaus.org/browse/MCOMPILER-120
> Project: Maven Compiler Plugin
> Issue Type: Bug
> Affects Versions: 2.1
> Reporter: Christopher Webster
> Assignee: Kristian Rosenvold
> Fix For: 2.4
>
> Attachments: JavacCompiler.java, JavacCompiler.patch,
> trial-maven.zip, werror.zip
>
>
> If I write a pom file like the following:
> {code:xml}...
> <plugin>
> <groupId>org.apache.maven.plugins</groupId>
> <artifactId>maven-compiler-plugin</artifactId>
> <version>2.1</version>
> <configuration>
> <compilerId>javac</compilerId>
> <source>1.6</source>
> <target>1.6</target>
>
> <compilerArguments>
> <Werror />
> <Xlint:all />
> </compilerArguments>
> <showDeprecation>true</showDeprecation>
> </configuration>
> </plugin>{code}
> and if there are only warnings, then the build will not fail as intended by
> the compiler Argument. The reason is that in compileInProcess the exit code
> from javac is only considered if there are no messages. In the case of
> treating warnings as errors, there will be messages but no errors so the
> intention of the build failure is lost.
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