20131128 (Thursday, 28 November 2013)

eidreader:

While trying once more (without success) to get The EIDReader applet running on Oracle Java, I had the following idea: maybe it is because the .jar file has been built using OpenJDK?

How to install Oracle Java on Ubuntu:

Summary:

$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java7-installer

How to see which Java is active::

$ update-java-alternatives  -l
java-1.6.0-openjdk-i386 1061 /usr/lib/jvm/java-1.6.0-openjdk-i386
java-1.7.0-openjdk-i386 1071 /usr/lib/jvm/java-1.7.0-openjdk-i386
java-7-oracle 1072 /usr/lib/jvm/java-7-oracle

$ update-java-alternatives -l
java-1.6.0-openjdk-i386 1061 /usr/lib/jvm/java-1.6.0-openjdk-i386
java-1.7.0-openjdk-i386 1071 /usr/lib/jvm/java-1.7.0-openjdk-i386
java-7-oracle 1072 /usr/lib/jvm/java-7-oracle


$ echo $JAVA_HOME

$ java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) Server VM (build 24.45-b08, mixed mode)

$ which java
/usr/bin/java


$ ll /usr/bin/java
lrwxrwxrwx 1 root root 22 Apr 17  2013 /usr/bin/java -> /etc/alternatives/java*
$ ll /etc/alternatives/java
lrwxrwxrwx 1 root root 39 Nov 28 03:40 /etc/alternatives/java -> /usr/lib/jvm/java-7-oracle/jre/bin/java*

$ ll /etc/alternatives/java
lrwxrwxrwx 1 root root 39 Nov 28 03:40 /etc/alternatives/java -> /usr/lib/jvm/java-7-oracle/jre/bin/java*

How to switch between Open and Oracle Java:

$ sudo update-java-alternatives -s java-1.7.0-openjdk-i386
$ ll /etc/alternatives/java
lrwxrwxrwx 1 root root 45 Nov 28 03:54 /etc/alternatives/java -> /usr/lib/jvm/java-7-openjdk-i386/jre/bin/java*

$ sudo update-java-alternatives -s java-7-oracle
$ ll /etc/alternatives/java
lrwxrwxrwx 1 root root 39 Nov 28 03:55 /etc/alternatives/java -> /usr/lib/jvm/java-7-oracle/jre/bin/java*

Voilà. Operation successful, result negative. No change. This doesn’t seem to be the reason.

Note also that there are 2 warnings during compilation:

javac -classpath applets/eid-applet-service.jar:applets/commons-codec.jar src/eidreader/EIDReader.java
Note: src/eidreader/EIDReader.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.