Class file not found in IntelliJ

java intellij-idea jpa

2022-09-02 00:34:58

In IntelliJ I get this weird error when I try to compile.

Cannot find annotation method 'cascade()' in type 'javax.persistence.ManyToOne': class file for javax.persistence.ManyToOne not found

I know, it seems pretty obvious what the problem is, but having spent too much time on this problem I now turn my trust to you!

I use ideaCommunity-9, where I have created a global library for JBoss, which contains all JBoss jars including ejb3-persistence.jar. My module includes this library, and I have moved it to the top of dependencies. No otherwhere in classpath I have a javax.persistence.ManyToOne class, and it also opens up in IntelliJ without problems.
If I open the file where I get the compile error, IntelliJ shows no problems and also navigates to the class file on pressing Ctrl+B.
The code is also build with ant and here it works fine.

Besides the above error I get six others along the same path (name in Table, etc.) - all related to JPA. I also get a message saying "Please file a bug to JDC yada yada yada."

答案 1

Try to tick a checkbox "export" in your dependencies.

I mean: "File" menu -> Project Structure -> Modules -> Dependencies, and there you can see libs included to the module. You should also see a checkbox near each lib in column 'Export'.

答案 2

Just got this myself but non of those things were my issue. I downloaded a project from github, then opened in intelli J with the problem after trying to run a junit test.

Solution: Project Structure -> Modules -> 'Project_Name' -> Sources (tab) -> click src folder -> Mark as: Sources

This should highlight src to be blue and all the class files should be the circles with C instead of looking like normal files. Try running a test again and see if that does it.