Using Eclipse for project development, adding @Override before a method in an implementation class indicates a “Multiple Markers at this line” error. The problem is described below
Multiple Markers at this line
– The Method getStudentById (String) of type StudentBeanImpl must override a superclass method
plements. Multiple Markers at this line
– The Method getStudentById (String) of type StudentBeanImpl must override a superclass method
-implements mgr.jc.student.service.IStudentBean.getStudentByID

Reason for this problem: JDK1.5 does not support this notation. Implementing interface methods requires overriding abstract methods.
The solutions to the above problems are as follows:
Method 1. Select Eclipse Window→Preferences→Java→Compiler and change the Compiler Compliance Level from 1.5 to above 1.6.

Right-click on Project and select the last Properties. Select the Java Compiler on the left, check the box inside, and change the Java Editor version to 1.6.

Method 3. Right-click the JRE System Library[javase-1.5]→Properties under Project, and select “javase-1.6 (jdk1.6.0_10)” and click OK.

All the above three methods can solve the problem mentioned in the question, you can choose the corresponding solution according to your own habits.