Sample pom follows question -
I want ${my.val} to be optional, not required, but I can't seem to find a
way to pass a blank and/or empty value at the command line.
mvn -Dsome.value="" package
I get the usual nonsense about a null argument (since when is an empty
string "null"?). However, if I try
mvn -Dsome.value=" " package
(note the space), Maven chokes pretty spectacularly:
[16:09:13][bmanica@nakoruru:/tmp]$ mvn -Dmy.val=" " clean package
---------------------------------------------------
constituent[0]: file:/usr/share/maven2/lib/maven-debian-uber.jar
---------------------------------------------------
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at
java.lang.AbstractStringBuilder.setLength(AbstractStringBuilder.java:143)
at java.lang.StringBuffer.setLength(StringBuffer.java:153)
at org.apache.maven.cli.CLIManager.cleanArgs(CLIManager.java:271)
at org.apache.maven.cli.CLIManager.parse(CLIManager.java:224)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:119)
at
org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Is this a bug in Maven (2.2.1)? Either way, how can I get Maven to let me
pass an empty string for this argument value?
<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.test</groupId>
<artifactId>test</artifactId>
<packaging>pom</packaging>
<version>0</version>
<name>test</name>
<url>http://maven.apache.org</url>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<id>Exec test</id>
<phase>prepare-package</phase>
<goals>
<goal>exec</goal>
</goals>
<configuration>
<executable>${env.JAVA_HOME}/bin/java</executable>
<arguments>
<argument>${my.val}</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
--
C. Benson Manica
[email protected]
