The type java lang CharSequence cannot be resolved in package declaration

Question

I get 2 classes in package P  Interface class A and its implementation class B   In the file with class B I get the following error  The type java lang CharSequence cannot be resolved  It is indirectly referenced from required  class files   I m using Eclipse Helios and    java -version java version  1 8 0 05  Java TM  SE Runtime Environment  build 1 8 0 05-b13  Java HotSpot TM  Server VM  build 25 5-b02  mixed mode    Standard solution of removing and adding JRE doesn t work   How can I fix it   EDIT  Code  Class A   package com jax   import javax jws WebMethod  import javax jws WebService  import javax jws soap SOAPBinding  import javax jws soap SOAPBinding Style     WebService  SOAPBinding style   Style RPC  public interface WebServiceInter     WebMethod String sayHello         Class B   package com jax       Error is here    import javax jws WebService    WebService endpointInterface    com jax WebServiceInter   public class WebServiceImpl implements WebServiceInter       Override     public String sayHello            return  Hello              Project structure   ProjectName -  Java Resources -  com jax -  Class A  Class B

User · Answer

Make your Project and Workspace to point to JDK7 which will resolve the issue  https   developers google com eclipse docs jdk compliance has given ways to modify Compliance and Facet level changes

User · Answer

Just trying to compile with ant  Have same error when using org eclipse jdt core-3 5 2 v 981 R35x jar  Everything is well after upgrade to org eclipse jdt core 3 10 2 v20150120-1634 jar

User · Answer

Your Eclipse software suite doesn t support Java 1 8  Download a newer version of Eclipse

User · Answer

Java 8 support for Eclipse Kepler SR2   and the new  JavaSE-1 8  execution environment showed up automatically    Download this one - Eclipse kepler SR2  and then follow this link - Eclipse Java 8 Support For Kepler

User · Answer

Java 8 supports default methods in interfaces  And in JDK 8 a lot of old interfaces now have new default methods  For example  now in CharSequence we have chars and codePoints methods  If source level of your project is lower than 1 8  then compiler doesn t allow you to use default methods in interfaces  So it cannot compile classes that directly on indirectly depend on this interfaces  If I get your problem right  then you have two solutions  First solution is to rollback to JDK 7  then you will use old CharSequence interface without default methods  Second solution is to set source level of your project to 1 8  then your compiler will not complain about default methods in interfaces

[java] The type java.lang.CharSequence cannot be resolved in package declaration

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