export HUDSON_HOME="http://server/path/to/hudson"
/opt/jdk1.6.0_03/bin/java -jar ../hudson-core-1.153.jar test make
java.lang.NullPointerException
at hudson.Proc$LocalProc.environment(Proc.java:88)
at hudson.Proc$LocalProc.<init>(Proc.java:80)
at hudson.Proc$LocalProc.<init>(Proc.java:76)
at hudson.Main.remotePost(Main.java:93)
at hudson.Main.run(Main.java:40)
at hudson.Main.main(Main.java:26)

Main.java Line 93
Proc proc = new Proc.LocalProc(cmd.toArray(new String[0]),(String[])null,System.in,

second parameter is null and will pass to LocalProc.environment.