Error:
JST Common Core (2.0.0.v200706041905-1007w311817231426) requires plug-in “org.eclipse.wst.common.project.facet.core (1.1.1)”, or compatible.

We can develop Java code in Flex builder standalone version too.While the standalone version of Flex Builder does not contain tools to edit Java code by default, you can install them as Eclipse plugins.

For updating Java Development Features in Flex IDE You need to install Java Development Tools (JDT) plug-in

Follow the steps below:
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1. Open Flex Builder IDE.

2. Select Help Menu >> Software Updates >> Click on Find and Install.

3. In Install/Update Dialogue box. Select “Search for new features to install” and Click on Next button.

4. In the results, choose Europa Discovery Site (If it asks to select mirror site, select near by site). And click Finish.

5. Select the Java Development package to install.

If it dsplays similar kind of error “JST Common Core (2.0.0.v200706041905-1007w311817231426) requires plug-in “org.eclipse.wst.common.project.facet.core (1.1.1)”, or compatible.”

Click on Select Required

6. Click Next. And accept the license.

8. Click Finish.

It will take some time to install. once Installed Check with the Perspective to create Java Projects.