Problema ao tentar executar o eclipse

Warning: -Xms40m not understood. Ignoring.

Warning: -Xmx512m not understood. Ignoring.

Warning: -XX:MaxPermSize=256m not understood. Ignoring.

Warning: -jar not understood. Ignoring.

Exception in thread “main” java.lang.NoClassDefFoundError: .downloads.eclipse.plugins.org.eclipse.equinox.launcher_1.0.101.R34x_v20080819.jar

at gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.5.0.0)

at _Jv_ThreadRun(java.lang.Thread) (/usr/lib/libgcj.so.5.0.0)

at _Jv_RunMain(java.lang.Class, byte const, int, byte const, boolean) (/usr/lib/libgcj.so.5.0.0)

at __gcj_personality_v0 (/downloads/eclipse/java.version=1.4.2)

at __libc_start_main (/lib/tls/libc-2.3.4.so)

at _Jv_RegisterClasses (/downloads/eclipse/java.version=1.4.2)