If .XML files suddenly stop opening in Internet Explorer on Windows 7, a few logical first steps would definitely be to make sure that the .XML file association is set to Internet Explorer, ensure ...

If the file has gone missing, check your git repository and perform a restore. You need that persistence.xml file to run your Hibernate and JPA applications. Sample persistence.xml file. If you are ...

You see, unlike the Java formatter, there is no option in Eclipse to auto-format XML upon save. Thus, it is left to the developer to not keep firing up the formatter, which quickly gets tiresome.