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I am running the Java 7 JRE from Oracle. I installed it through terminal and it works properly with my web browsers, and otherwise, as far as I can tell.

However, I was browsing through my installed packages in Software Center, and noticed that both the openjdk-7-jre-lib Install openjdk-7-jre-lib and openjdk-7-jre-headless Install openjdk-7-jre-headless packages were still installed from when I had the OpenJKD JRE installed, which I have since uninstalled, but did use for a good period of time before I switched.

Should those be there, or might they cause complications if I leave them installed? Or would it be best to leave them installed?

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It won't do any harm if you leave them installed. If you do decide to uninstall them (because I don't think they're needed since you're using Oracle's JRE), make sure it does not offer to uninstall other important packages with them.

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You could remove OpenJDK JRE without any problem or leave it just the same.

Java is a technology from Oracle (formerly: Sun Microsystems). There are several implementations:

  1. OpenJDK: The primary goal of the OpenJDK project is to produce an open-source implementation of the Java SE Platform (6 and 7). This is the default version of Java that Ubuntu uses and is the easiest to install.

  2. Oracle (Sun) Java 6: Oracle (Sun) Java 6 is the reference implementation for Java 6.

  3. Oracle Java 7: Oracle Java 7 is the reference implementation for Java 7.

  4. IBM Java: IBM Java is the preferred Java solution on PowerPC machines. It is a reimplementation with a Just-In-Time Compiler. It is only available from IBM's website.

To manage your Java version/flavour in terminal use update-alternatives, to list the available java versions update-alternatives --list java.

If you'd wish all could be installed without issues, and you could choose witch one to use using update-alternatives --config java**

Please take note that java as four components, they must all be configured to you preference.

  1. java Java Runtime Environment (JRE);
  2. javaws Java Web Start, Java application over the net;
  3. javac Java Compiler, JDK for Developers;
  4. And of course the browser plugin, currently mine is libnpjp2.so with firefox is easy to find out yours just type about:plugins in the address bar.

Normally the several java flavors/versions are in /usr/lib/jvm, me, for example have OpenJDK and two different versions of Oracle-Java.

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