Re: [m2e-users] m2e creates invalid Eclipse compiler project settings

["Champault, P. - Pierre-Jean -" <Pierre-Jean.Champault@xxxxxxxxxxxxxxxx>]

Ooops, you’re correct!

I’ve got 2 suggestions:

-          To find out where the problem lies, what about building your project outside of Eclipse, just using Maven?

-          What about only specifying either nothing or only source, since you seem to be wanting the default behaviour?

 

 

From: m2e-users-bounces@xxxxxxxxxxx [mailto:m2e-users-bounces@xxxxxxxxxxx] On Behalf Of King Holger (CI/AFP2)
Sent: 14 March 2013 17:48
To: Maven Integration for Eclipse users mailing list
Subject: Re: [m2e-users] m2e creates invalid Eclipse compiler project settings

 

Hi Pierre-Jean,

 

>Hi,

>That is unrelated to m2e or Eclipse. This is a Java constraint. You will find the meaning of those flags here: http://docs.oracle.com/javase/7/docs/technotes/tools/windows/javac.html. It >should make it clear why the combination you are using is not valid.

 

to my understanding, the combination I use for source and target is valid. Your link shows that below the following chapters:

Cross-Compilation Options, saying: “If -source is 1.6, the value of -target is 1.7”

 

Am I wrong?

 

>Best regards,

>PJ

 

From: m2e-users-bounces@xxxxxxxxxxx [mailto:m2e-users-bounces@xxxxxxxxxxx] On Behalf Of King Holger (CI/AFP2)
Sent: 13 March 2013 18:10
To: m2e-users@xxxxxxxxxxx
Subject: [m2e-users] m2e creates invalid Eclipse compiler project settings

 

Dear m2e community,

 

I’m having installed:

• Eclipse Juno Service Release 2
• m2e plugin version 1.3.1.20130219-1424

 

with the following Maven „pom.xml“:

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-compiler-plugin</artifactId>

<version>2.5.1</version>

<configuration>

<!-- used by "m2e" Eclipse plugin to update the

     "Source compatibility level" and "Compiler compliance

            level" within the Eclipse project "Java compiler"

            settings when running "Maven" -> "Update project". -->

<source>1.6</source>

       <!-- used by "m2e" Eclipse plugin to update the

            "Generated .class files compatibility" within the

            Eclipse project "Java compiler"

            settings when running "Maven" -> "Update project".

            It also changes the "JRE System Library" version within

            the "Java Build Path" Eclipse project settings. -->

<target>1.7</target>

       <compilerArgument>-Xlint:all</compilerArgument>

       <showWarnings>true</showWarnings>

       <showDeprecation>true</showDeprecation>

</configuration>

 

The problem:

• when updating the Eclipse project configuration using m2e based on the “pom.xml” (Maven -> Update project -> Update project configuration from pom.xml), I get an invalid Eclipse “Java compiler” configuration setting for this project, as Eclipse tells me “Classfile compatibility must be equal or less than compliance level”

 

The root cause:

• the “maven-compiler-plugin” setting for <target> is not used to set the “Compiler compliance level”. So, it differs compared to the setting “Generated .class files compatibility”.
• m2e does ignore a potential available setting “<compilerVersion>1.7</compilerVersion>”

 

Is it a real bug or is there a solution available?

 

Best regards,

Holger King