No persistence.xml file found in project

1. edit file org.eclipse.wst.common.project.facet.core.xml under directory of .setting 

2. then get rid of line like bellow

No persistence.xml file found in project

3.delete file name like  this org.eclipse.jpt.core.prefs  under directory  of  .setting 

  or delete file of filename contain "jpt"

4.close project ....then open project ....refresh .....OK

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