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