I tried what suggested and I think things got worse. Now I have in Error Log:
eclipse.buildId=M20090917-0800
java.version=1.6.0_15
java.vendor=Apple Inc.
BootLoader constants: OS=macosx, ARCH=x86, WS=cocoa, NL=en_GB
Framework arguments: -product org.eclipse.epp.package.java.product -keyring /Users/alan/.eclipse_keyring -showlocation
Command-line arguments: -os macosx -ws cocoa -arch...
2009-11-12 12:11:49 UTC in Pydev for Eclipse