Unbound classpath container: ‘JRE System Library [JavaSE-1.7]’

maven ——> When updating a project, an error appears as shown in the title. After checking the cause, it is found that the. Classpath file in the project directory has more lines as shown in the figure below. Just comment them out. If necessary, configure build path to add JRE library again. (when this error occurs, another error may come out: the project cannot be built until build path errors are resolved)


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