In the Java programming language, “Cannot resolve symbol” is an error message that tells the user that the Java compiler cannot locate a symbol referenced in the source code. This common error prevents Java programs from running properly.
The following often cause “Cannot resolve symbol”:
- Class files needed by the compiler and the source code may be missing. This normally happens when a particular class file becomes corrupted or is removed or renamed.
- A CLASSPATH may be faulty. A CLASSPATH is an environment variable that provides information to the compiler regarding the location of class files. When this variable is not working, the compiler will not be able to identify the symbol although it may in fact be present.
- A symbol name may be capitalized or spelled incorrectly. When writing codes for large programs or when trying to beat a deadline, individuals tend to type hastily. As a result, they do not notice that they sometimes type symbol names incorrectly. If this happens, the compiler would be unable to match the symbol in the source code with those in the class files.
There are other less common causes of the “Cannot resolve symbol” error. These include a variable, which was not declared, and a method called with the incorrect types of arguments.
Writing the codes carefully is the best way to prevent the said errors. Java programmers should always check their blocks of code and look for the possible mistakes mentioned above.