maven

Auto generate your pom

mvn archetype:create -DgroupId=com.magicmonster -DartifactId=test-app

This will create a 'test-app' directory IN the direct you run this from. It won't work if you have an existing 'test-app' directory

This is annoying if you have already created your files, so I moved the pom.xml up a level and will remove the src and test directories later.

You can use:

mvn archetype:generate -DgroupId=com.magicmonster -DartifactId=test-app

instead, and it will prompt you about the type of artifact you want to create

mvn package

I ran 'mvn package' but this is wrong because I wanted to create a webapp not a jar.

I have opened up pom.xml, and changed the packaging element to a 'war' instead of 'jar'. The very short guide to webapps says when using archetype:create we could have specified -DarchetypeArtifactId=maven-archetype-webapp

add web.xml for webapp

maven complained about a missing web.xml. By default maven will look for it in src/main/webapp/WEB-INF/web.xml so I have moved it there.

Move all jsp and static files to src/main/webapp too, then they will appear in the war file.

cleaning build

run "maven clean package"

src code dir

Move your java code to src/main/java otherwise it will not be compiled.

1.5 not supported

I was receiving errors for

generics are not supported in -source 1.3

for-each loops are not supported in -source 1.3

To fix add

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-compiler-plugin</artifactId>
  <configuration>
    <source>1.5</source>
    <target>1.5</target>
  </configuration>
</plugin>
      

to pom.xml. I'm not sure why I need to configure the plugin this way.. wouldn't the compiler come with my project by default?

Missing dependencies

This is much like maven 1. To download spring frame work add the following dependency into the pom.xml

 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring</artifactId>
  <version>2.0.6</version>
</dependency>
      

Dependency scope is specified in the pom.xml. You have more options now

Dependencies of dependencies are automatically used now.

Executing java

As part of my build I have a java program that needs executing.

I found a plugin called antrun . The antrun usage guide helps if you already know ant. I have set this to execute during the 'generate-sources' phase. A list of phases can be found at the lifecycle guide. I am not sure which one is good to use.

classpaths can be 'exported' the the ant builder using instructions found under Referencing the maven classpaths .

Exception in thread "main" java.lang.NoClassDefFoundError: com/werken/forehead/Forehead

This happens when running maven 1 (maven executable) and environment variable MAVEN_HOME is pointing to the maven2 installation. Fix the MAVEN_HOME environment variable to point to maven1 installation instead.