How to solve the jpa error?

i created one web application for accessing google bigtable. but i show开发者_高级运维s the following error how to solve this

Description Resource Path Location Type Your Web Application Project must be configured to use a JDK in order to use JSPs. guestbook.jsp /cftljpa/war Unknown Google App Engine Problem

how to solve this

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Both the local App Engine server and the deployment process need to run javac in order to compile your JSPs. If your project isn't set to use a JDK ("Java Development Kit", which includes javac), then the JSPs can't be compiled. Go to Preferences > Java > Installed JREs and make sure that you have a JDK installed -- if you don't, you can easily download one. Now right-click on your project and choose Properties > Java Build Path > Libraries and make sure that your project is using this JDK