"Update Maven Project" removes accessrules from JRE_CONTAINER

[atnak]

Running "Maven > Update Maven Project" removes <accessrules> for the <classpathentry path="org.eclipse.jdt.launching.JRE_CONTAINER/..."> entry in the .classpath file.

The symptoms are the same as this issue that was resolved in 2017. I assume perhaps the previous fix resolved the issue for <classpathentry path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER"> but not for org.eclipse.jdt.launching.JRE_CONTAINER.

Below is an example <classpathentry> that is affected:

<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
	<attributes>
		<attribute name="maven.pomderived" value="true"/>
	</attributes>
	<accessrules>
		<accessrule kind="discouraged" pattern="java/lang/StringBuffer"/>
		<accessrule kind="nonaccessible" pattern="com/sun/javafx/collections/**"/>
		<accessrule kind="nonaccessible" pattern="java/awt/List"/>
		<accessrule kind="nonaccessible" pattern="org/omg/**"/>
	</accessrules>
</classpathentry>