[jira] Commented: (MCOMPILER-114) Setting the debug option to false still compiles the code with line numbers resulting in increased class file.

["Stephen Bannasch (JIRA)" <ji...@codehaus.org>]

    [ http://jira.codehaus.org/browse/MCOMPILER-114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=242301#action_242301 ] 

Stephen Bannasch commented on MCOMPILER-114:
--------------------------------------------

When I compile with {{-Dmaven.compiler.debug=true}} I *do* get a reduction in size however compiled code is still 10-20% larger than that compiled by either ant with debug=false or javac with the '-g:none' option.

Here's a closer look at the same class extracted from jars created with maven and ant using debug-false:

{code}
$ javap -l -verbose -c org/concord/mw2d/ActionStateEvent
{code}

The maven-generated class had three constants not in the ant-generated class:

{noformat}
const #12 = Asciz	LineNumberTable;
const #16 = Asciz	SourceFile;
const #17 = Asciz	ActionStateEvent.java;
{noformat}

In addition each method in the class had a LineNumberTable like this:

{code}
LineNumberTable:
 line 30: 0
 line 31: 5
 line 32: 10
 line 33: 15
{code}

It seems the only way to get maven to compile without the debugging resources is to add 'g:none' as a compiler argument for javac ... and this doesn't work from the command line -- it only works if it is in the configuration element for the maven-compiler-plugin in the pom like this:

{code}
<build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <configuration>
        <compilerArgument>-g:none</compilerArgument>
        <source>1.5</source>
        <target>1.5</target>
      </configuration>
    </plugin>
  </plugins>
</build>
{code}

If the compilerArgument to 'g:none' is not set in the pom I can't get any variation of the following command line arguments to compile without some debugging info.

with or without:

{noformat}
maven.compiler.debug=false
{noformat}

with or without any of the following:

{noformat}
maven.compiler.compilerArgument=g:none
maven.compiler.compilerArgument='g:none'
maven.compiler.compilerArguments=g:none
maven.compiler.compilerArgument='g:none'
{noformat}

But I'd like the default to include debugging resources and to be able to easily optionally package without the debug resources -- the easiest way would be able to pass in a command line argument ...


> Setting the debug option to false still compiles the code with line numbers resulting in increased class file.
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: MCOMPILER-114
>                 URL: http://jira.codehaus.org/browse/MCOMPILER-114
>             Project: Maven 2.x Compiler Plugin
>          Issue Type: Bug
>    Affects Versions: 2.1
>         Environment: Windows XP Professional Version 5.1.2600 Service Pack 3 Build 2600, Dell OptiPlex GX280, Total Physical Memory 4,096.00 MB
>            Reporter: Grzegorz Solecki
>         Attachments: TestApp.zip
>
>
> Given the following example:
> {code:title=Bar.java|borderStyle=solid}
> public class Main {
>    public static void main(String[] args) {
>       for (StackTraceElement stackTraceElement : Thread.currentThread().getStackTrace())
>          System.out.println(stackTraceElement);
>    }
> }
> {code} 
> and pom.xml
> {code:xml}
> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
>    <modelVersion>4.0.0</modelVersion>
>    <groupId>com.greg</groupId>
>    <artifactId>TestApp</artifactId>
>    <version>1</version>
>    <build>
>       <plugins>
>          <plugin>
>             <groupId>org.apache.maven.plugins</groupId>
>             <artifactId>maven-compiler-plugin</artifactId>
>             <configuration>
>                <debug>none</debug>
>                <source>1.5</source>
>                <target>1.5</target>
>             </configuration>
>          </plugin>
>       </plugins>
>    </build>
> </project>
> {code} 
> after compiling and running we get:
> {panel:title=cmd}
> {noformat}
> {TestApp}\target\classes>dir Main.class
> 05/02/2010  XX:XX               564 Main.class
> {TestApp}\target\classes>java -cp . Main
> java.lang.Thread.dumpThreads(Native Method)
> java.lang.Thread.getStackTrace(Thread.java:1383)
> Main.main(Main.java:3)
> {noformat} 
> {panel}
> *NOTE !!!: the number of line (Main.java:3) has been shown*
> However when you compile the same java code using the javac we get:
> {panel:title=cmd}
> {noformat}
> {TestApp}\src\main\java>javac -g:none -source 1.5 -target 1.5 Main.java
> {TestApp}\src\main\java>dir Main.class
> 05/02/2010  XX:XX               477 Main.class
> {TestApp}\src\main\java>java -cp . Main
> java.lang.Thread.dumpThreads(Native Method)
> java.lang.Thread.getStackTrace(Thread.java:1383)
> Main.main(Unknown Source){noformat} 
> {panel}
> *NOTE !!!: the number of line has not been shown*
> Please find the whole sample project in Eclipse that uses m2eclipse plugin, that is configured for using external maven 2.2.1

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