Java doesn´t find the CLASSPATH (System variable)


 
Thread Tools Search this Thread
Homework and Emergencies Homework & Coursework Questions Java doesn´t find the CLASSPATH (System variable)
# 1  
Old 04-19-2016
Java Java doesn´t find the CLASSPATH (System variable)

1. The problem statement, all variables and given/known data:

As a excercise I have to compile a program (Hello2.java) with a class file (HelloText.java) in another directory. (As you seen in the screenshot)
I´m setting a PATH and a CLASSPATH (system variables). It´s working without a command. But if I use a command like java or javac which I need to compile ITS NOT WORKING.
I can´t retrace why the bash is doing this respectively is not doing this.

2. Relevant commands, code, scripts, algorithms:

PATH=$PATH:<directory>, CLASSPATH =$CLASSPATH:<directory>, cd (change directory), javac

3. The attempts at a solution (include all code and scripts):

see the screenshot.

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):

Beuth Hochschule für Technik, Berlin, Germany, Radners, Programmierung I (Praxis)
-problempng
# 2  
Old 09-26-2016
You didn't set the environment variable CLASSPATH, but a shell variable of this name, i.e. only the shell sees this. What you did here is similar to setting a variable in your Java program, then run a shell program from Java and hope that the Java variable is visible to the shell program.

In shell context, "environment variables" are sometimes also called "exported variables", because the child processes can see them. Each shell has a different way to set an environment variable. For example, bash or zsh use the command export, while csh or tcsh use the command setenv.

You didn't specify, which shell you are using. Consult the man page of your shell to find out, how to set environment variables.
# 3  
Old 02-13-2017
export CLASSPATH=/your/stuff/

or preserving system wide settings:

export CLASSPATH=$CLASSPATH:/your/addition/

the only different from Windows in terms of path-separators, : instead of ;

For example

java -classpath /mydir/mylib.jar:/otherdir/otherlib.jar com.MyProgram -Xmx64m

wildcard in the classpath to add multiple jars


java -cp "Halo.jar:lib/*" ni.package.MainClass

Java Path and Java ClassPath

Anto

Last edited by antoniosarco; 02-13-2017 at 02:28 AM..
Login or Register to Ask a Question

Previous Thread | Next Thread

8 More Discussions You Might Find Interesting

1. Red Hat

Process not running: /opt/java15/jdk/bin/java -classpath /opt/apache/apache-ant-1.7.0-mod/lib/ant-la

Have no idea on what the below error message is: Process not running: /opt/java15/jdk/bin/java -classpath /opt/apache/apache-ant-1.7.0-mod/lib/ant-launcher.jar org.apache.tools.ant.launch.Launcher -buildfile build.xml dist. Any help? (3 Replies)
Discussion started by: gull05
3 Replies

2. Solaris

Solaris: ldd doesn't find libraries in exported environment variable LD_LIBRARY_PATH

I have given the relevant details below. Why are the libraries in /export/home/builds/pc9x_root/960/build/powrmart/pmbuild/bin/SunOS.64.r are invisible to ldd? %setenv ... (3 Replies)
Discussion started by: old_as_a_fossil
3 Replies

3. UNIX for Advanced & Expert Users

Fedora java classpath

What is the proper way to set your java classpath? (0 Replies)
Discussion started by: cokedude
0 Replies

4. Programming

Classpath of JAVA

Hello, ABC question as I could not get a direct answer: How to locate the default IO class of JAVA? My question was triggered by the row in most java programimport java.io.* as I am very curious where the io class is located in my Mint14 (Ubuntu12.10). I am aware it is similar to use DBI in PERL,... (1 Reply)
Discussion started by: yifangt
1 Replies

5. Ubuntu

Trouble setting up Java classpath

Saw an error while setting up an application called i2phex: # ./run.sh java.lang.RuntimeException: Failed to initialize phex.net.repres.i2p.I2PPresentationManager at phex.common.ManagerController.initializeManagers(ManagerController.java:78) at phex.Main.main(Main.java:161)After... (0 Replies)
Discussion started by: Israel213
0 Replies

6. Programming

regarding classpath java

Hi, I have a below command.... $JAVA_HOME/bin/java -cp "/usr/orabase/product/10.2.0/lib:/usr/java/javajar/common/sched.jar:/usr/orabase/product/10.2.0/jdbc/lib/ojdbc14_g.jar:/usr/orabase/product/10.2.0/jdbc/lib/classes12.jar" com.abrt.smart.Smart I want to know where the Smart.class is... (1 Reply)
Discussion started by: PRKS
1 Replies

7. Programming

exit status running java classpath in unix shell

I have a java classpath running inside of a unix shell script. During my testing it will error with lines that show an example like this below. java.io.FileNotFoundException error at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.<init>(FileInputStream.java:129), ... (2 Replies)
Discussion started by: mmcds
2 Replies

8. UNIX Desktop Questions & Answers

my sgi system doesn't come up

:( Hi there, I have an O2 sgi and the other day when I was restarting the system it didn't come up. The error message is: unable to open "si(0)disk(2)rdisk(0)partition(0)": no such device I was assuming a hardware problem, but not for sure. Is there any one who could kindly tell me what... (1 Reply)
Discussion started by: siavoush
1 Replies
Login or Register to Ask a Question