Select the Design TAB, and erase all of the existing content.
选择Design选项卡,然后擦除全部现有内容。
Click to the Design TAB if you see the persistence.xml source.
如果您看到persistence . xml源的话,那么您可以点击design项。
Verify that the Design TAB is selected and set the cursor on the new text.
确保选择Design选项卡,并将光标定位在新创建的文本上。
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