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I'm not able to install jdk-1_5_0_12-nb-5_5_1 bundle on linux. I've got this error: No Java Runtime Environment(JRE) was found on this system.
It looks like your download is corrupted. I downloaded installer and it works fine. Verify MD5 checksum: [~]> md5sum jdk-1_5_0_12-nb-5_5_1-linux-ml.bin.sh 45fe936215c83998ad00bdc914053ec9 jdk-1_5_0_12-nb-5_5_1-linux-ml.bin.sh
This is known problem on FC4 with SE Linux enabled. Workaround is to disable SE Linux. It happens with JDK 6 and not JDK 5. We use JRE 6 as bundled JVM in jdkbundle installer.
See http://forums.java.net/jive/thread.jspa?threadID=1546&tstart=60 for more details.