How to run 32bit RCU on 64bit Linux in graphical mode?

RCU is available only on 32-bit x86 Linux and 32-bit Microsoft Windows operating system platforms. For Release 11.1.1.4.0 and later, RCU can also be run on 64-bit x86 Linux and 64-bit Microsoft Windows operating systems. 

If you run the RCU in graphical mode using x11 client from the 64-bit x86 Linux, you will get following error:-

Exception in thread "Main Thread" java.lang.InternalError: Can't connect to X11 window server using 'localhost:10.0' as the value of the DISPLAY variable.

        at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)

        at sun.awt.X11GraphicsEnvironment.access$100(X11GraphicsEnvironment.java:52)

        at sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:155)

        at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:131)

        at java.lang.Class.forName0(Native Method)

        at java.lang.Class.forName(Class.java:169)

        at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)

        at sun.awt.X11.XToolkit.<clinit>(XToolkit.java:89)

        at java.lang.Class.forName0(Native Method)

        at java.lang.Class.forName(Class.java:169)

        at java.awt.Toolkit$2.run(Toolkit.java:834)

        at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:826)

        at com.jgoodies.looks.LookUtils.isLowResolution(LookUtils.java:484)

        at com.jgoodies.looks.LookUtils.<clinit>(LookUtils.java:249)

        at com.jgoodies.looks.plastic.PlasticLookAndFeel.<clinit>(PlasticLookAndFeel.java:135)

        at oracle.sysman.assistants.rcu.ui.InteractiveRCUModel.<init>(InteractiveRCUModel.java:117)

        at oracle.sysman.assistants.rcu.Rcu.execute(Rcu.java:292)

        at oracle.sysman.assistants.rcu.Rcu.main(Rcu.java:344)

Solution

1.       Go to $RCU/bin and change the permission of rcu.sh file using chmod 755 rcu

2.       Edit the rcu.sh using nano rcu

3.       Change the 32bit JRE path to with 64bit JRE path

JRE_DIR=export JAVA_HOME=/apps/oracle/java/jrockit-jdk1.6.0_26/ jre

Now, run the rcu again.