Eclipse error ... cannot be resolved to a type

Question

I have a dynamic web project that I am working on to migrate a jsp/servlet app from JRun to Tomcat.

I am getting the error: com.ibm.ivj.eab.dab.DatastoreJDBC cannot be resolved to a type.

I have the *.class files sitting inside a com/ibm/ivj/eab/dab folder (exactly how I found them). I have tried creating a jar file and adding that to the build path via "Add External Jar", I have also tried adding an "External Class Folder" and pointing to the folder that contains the "com" directory in question.

Still, the error persists. What is strange is if I start typing the package name eclipse actually auto-completes the class for me! (pictured below). Any ideas would be greatly appreciated. Maybe the classes were compiled for a much older java version and that is causing trouble? Maybe there is something I need to do to ensure the classes end up in the WEB-INF/lib directory?

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Answer 1

Also If you are using mavenised project then try to update your project by clicking Alt+F5. Or right click on the application and go to maven /update project.

It builds all your components and resolves if any import error is there.

Answer 2

1. Right click your project name.

2. Click Properties.

3. Click Java Build Path.

4. Click on Add Class Folder.

5. Then choose your class.

Alternatively, Add Jars should work although you claim that you attempted that.

Also, "have you tried turning it off and back on again"? (Restart Eclipse).

Answer 3

To solve the error "...cannot be resolved to a type.." do the followings:

1. Right click on the class and select "Build Path-->Exclude"
2. Again right click on the class and select "Build Path-->Include"

It works for me.

Answer 4

There are two ways to solve the issue "cannot be resolved to a type ":

1. For non maven project, add jars manually in a folder and add it in java build path. This would solve the compilation errors.
2. For maven project, right click on the project and go to maven -> update project. Select all the projects where you are getting compilation errors and also check "Force update of snapshots/releases". This will update the project and fix the compilation errors.