Java was started by returned exit code=1

Possible causes include:  The eclipse.ini configuration, wrong JAVA version, incorrect or corrupted JAVA installation and incompatibility between an eclipse plugin and the JAVA version.

Following are some links that list some of the causes and possible solutions for this error:

1.  Add the command -XX:-UseCompressedOops  at the end of the eclipse.ini file.  See the following link where this action is reported to resolve this issue:

http://www.eclipse.org/forums/index.php/m/653614/#msg_653614

2.  Remove and reinstall both the JAVA JDK and JRE.  See the following link where this action is reported to resolve this issue:

http://anmolanand.wordpress.com/2011/06/19/eclipse-java-was-started-but-returned-exit-code-1/

3.  Check to make sure that a JAVA update did not cause the error.  See the following links where a JAVA update is reported to have caused the issue:

http://www.coderanch.com/t/503269/vc/Eclipse-start-but-return-exit

http://stackoverflow.com/questions/4587518/eclipse-error-on-startup-windows-7

4.  Some eclipse plugin may not be compatible with the installed JAVA version.  See the following link where this situation is reported to have caused the issue:

http://www.eclipse.org/forums/index.php/t/266786/