The Compiler Cannot Resolve Symbols in J2EE

[NIcaBoy]

I have created an application in J2EE. When I am running that application I am getting an error. The error that I am getting is

cannot resolve symbol
...
BUILD FAILED
...
Compile failed, messages should have been provided

Later I came to know that the Compiler Cannot Resolve Symbols I don't know why this is happening. Can anyone tell me some useful solution.!!

[CodGuru]

The error "cannot resolve symbol" comes when the compiler cannot locate a symbol referenced in your source code. I have faced this error many times but in Java. The causes for this common error in Java are :

1. When the symbol name is misspelled.
2. A missing class file.
3. When you enter a data type which is incorrect.
4. A method is called with the wrong number or types of arguments.

Writing the codes carefully is the best way to prevent the said errors.

[Viensterrr]

This error in J2EE comes mostly because of the incorrect environment variable. So I would like to suggest you to check whether you've set the J2EE_HOME environment variable correctly. The installation instructions for the J2EE SDK and ant explain how to set the required environment variables. This error can be caused because of the ant converter. When you type ant converter, the compiler reports many errors also the one that you have mentioned.

[kyosang]

Mainly the error mentioned by you might have caused because of the environment variables. You will have to check the value of the environment variables as I shown below :

Environment Variable Value
J2EE_HOME - The path of the J2EE SDK installation
JAVA_HOME - The path of the J2SE SDK installation
ANT_HOME - The path of the ant installation
PATH - Should include the bin directories of the J2EE SDK, J2SE, and ant installations

[opaper]

For your more information I would like to tell you the basic part of J2EE. Check that you are not making any mistake in this. For launching the J2EE server, type the following command after opening a terminal window :

j2ee -verbose

The verbose option is not required but putting it is useful for debugging.
For stopping the server, you will have to type the following command :

j2ee -stop