java on command

[sapna manga]

Hello everyone,
I installed jdk1.5.0_06 and as per sun installation guide i added java\jdk1.5.0_06\bin etc. to class path.
I tried the following commands at command promt c:\>
java - verion and it's worked.
when i tried c:\> javac
it is giving 'javac' is not recognized as an internal or external command,operable program or batch file.
if i tried it at promt C:\Program Files\Java\jdk1.5.0_06\bin> javac it is giving all it's options.
if i try C:\Program Files\Java\jdk1.5.0_06\bin> javac hellowworld.java
It is giving
"error: error reading C:\Program Files\Java\jdk1.5.0_06\bin\javac.exe; error in opening zip file"

Why i can't compile a program? I added every thing to classpath.

Please help me . I'm desparate to get it done.

thanks,
Sapna

[Nathaniel Stoddard]

You probably need to put the java bin directory in your PATH.

[Henry Wong]

I installed jdk1.5.0_06 and as per sun installation guide i added java\jdk1.5.0_06\bin etc. to class path.

Did you add the bin directory to the PATH? or CLASSPATH? It is supposed to be the PATH environment variable.

Henry

[sapna manga]

Yes i did. This is my classpath

C:\Program Files\Java\jdk1.5.0_06\bin;C:\Program Files\Java\jdk1.5.0_06\bin\javac.exe;C:\Program Files\Java\jdk1.5.0_06\bin\java.exe;C:\Program Files\Java\jdk1.5.0_06\lib;C:\Program Files\Java\jdk1.5.0_06\lib\tools.jar;C:\Program Files\Java\jdk1.5.0_06\bin\jar.exe;C:\Program Files\Java\jdk1.5.0_06\bin\javah.exe

is there anything wrong in this?

[Ernest Friedman-Hill]

There are two different environment variables we are talking about.

One is PATH. Windows uses it to find programs to run. The entries are directories in which *.EXE files can be found.

The other is CLASSPATH. Java uses it to find *.CLASS files to load. The entries are *.JAR files containing classes, or directories containing classes.

For someone just starting out in Java, PATH should include an entry for "C:\Program Files\Java\jdk1.5.0_06\bin\". CLASSPATH should not be defined. If you have a definition for CLASSPATH, delete it.

Note that the example you just showed above, with all the *.EXE files listed, is completely incorrect no matter what variable you're talkiing about. Neither PATH nor CLASSPATH would ever include *.EXE files.

[sapna manga]

thanks.
i removed .exe files from my class path . now javac is working . i am able to compile .java and no errors.
but when i say c:\> java helloworld it is giving error"Exception in thread "main" java.lang.NoClassDefFoundError: helloworld/class"

How can i get rid of it?

--sapna

[jay nair]

Originally posted by sapna manga:
thanks.
i removed .exe files from my class path . now javac is working . i am able to compile .java and no errors.
but when i say c:\> java helloworld it is giving error"Exception in thread "main" java.lang.NoClassDefFoundError: helloworld/class"

How can i get rid of it?

--sapna

if u are in C:\ then you have to make sure the helloworld.java file is there in c:> itslef else it will give this error ... u hv to be in folder in which u have the .java file in order to compile and run it ....

[sapna manga]

i have both .java and .class files are in c drive and i'm running the java class file from C only.
I'm doing
c:\> java helloworld

[Vijay Raj]

Make sure the crrent director is in the CLASSPATH. you can do this by adding '.' in the CLASSPATH. For example, CLASSPATH = .;C:\java;C:\ibm\

The dot in the beginning tells the java rntime to check for classes in teh current directory also.

regards,
vijay.

[sapna manga]

Thanks
It's working.

[Stan James]

See if this tutorial helps.

[Yogendra Joshi]

Hey , Also there is an switch which can be helpful in case the user is not in the directory where the java , class files are located and still they want to compile and run them.

Here's how , Like sapna said , She had her her Java and class files in C:\ i.e root , What she might have done is , She might have given a command like this

c:>javac - d . helloworld.java

And it compiles and run's just fine..

Have a great day !

Yogendra Joshi.

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