Eclipse Error: java.lang.CharSequence cannot be resolved

Question

I\'m getting a error trying to compile a simple code in Eclipse. I\'m using jre8.

For example, when I try to compile this code:

import java.util.ArrayLis         


        

Answer 1

Ensure that your Eclipse IDE supports Java 8:

The first Eclipse version supporting Java 8 was Eclipse Kepler SR2 (4.3.2) with an additional patch. (See: Installing Java™ 8 Support in Eclipse Kepler SR2, and the corresponding Marketplace Item that needs to be installed: Java 8 support for Eclipse Kepler SR2).

In my opinion you should udpate to the latest Eclipse Version.

With Luna SR2 (4.4.2) no additional patch is necessary.

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Ensure the 1.8 JRE is available in your Workspace:

Windows > Preferences: Java > Installed JREs

If this is not the case you can add a new JRE with the add button.

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Ensure that JRE System Library == JavaSE-1.8 for your Project

In the Package Explorer, you should see the Java version:

If this is not correct you should open the context menu the JRE System Library item and select the Properties menu entry.

In your project you have a .classpath file (Use the Navigator View if you do not see the file), that should looks like this:

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Rebuild your project

Project Menu > Clean...

Select your project from the list or "Clean all projects" and "Start a build immediately"

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See also:

• Explaination from @mkrakhin in his answer: The type java.lang.CharSequence cannot be resolved in package declaration