Hello fellow Linux users,

on CentOS 7.2 I have successfully downloaded and installed Oracle Java [1] with:

# rpm -Uvh jdk-8u91-linux-x64.rpm

Also there is already OpenJDK installed:

# rpm -qa | grep -i jdk java-1.8.0-openjdk-headless-1.8.0.91-0.b14.el7_2.x86_64 java-1.8.0-openjdk-1.8.0.91-0.b14.el7_2.x86_64 jdk1.8.0_91-1.8.0_91-fcs.x86_64

I can switch between the 2 using this command:

# alternatives --config java

There are 2 programs which provide 'java'.

Selection Command ----------------------------------------------- * 1 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.91-0.b14.el7_2.x86_64/jre/bin/java + 2 /usr/java/jdk1.8.0_91/jre/bin/java

Enter to keep the current selection[+], or type selection number:

And see the selected version with:

# java -version java version "1.8.0_91" Java(TM) SE Runtime Environment (build 1.8.0_91-b14) Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)

# javac -version javac 1.8.0_91

Now to my problem please -

I have created a simple java file named TheClassName.java:

package thepackagename;

public class TheClassName { public static final void main(String[] args) { System.out.println("Hello World!"); } }

After successfully compiling it with "javac TheClassName.java" (which produces TheClassName.class file in the same dir) I unfortunately can not run it:

# java -cp . thepackagename.TheClassName Error: Could not find or load main class thepackagename.TheClassName

Here another try:

# export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.91-0.b14.el7_2.x86_64/jre

# $JAVA_HOME/bin/java -cp . thepackagename.TheClassName Error: Could not find or load main class thepackagename.TheClassName

Setting another environment variable does not help either:

# export CLASSPATH=.

Similar command on Windows 7 works well and I have tried copying the TheClassName.class file from there to Linux too.

The setting is SELINUX=disabled and the server was installed few weeks ago, serving (without errors) as LAMP with MySQL/PostgreSQL/Apache/WordPress.

Any suggestions please, have I missed anything?

Regards Alex

[1]: http://www.oracle.com/technetwork/java/javase/