Add known problems section to NB12 with workaround for maven caching problem
diff --git a/netbeans.apache.org/src/content/download/nb120/nb120.asciidoc b/netbeans.apache.org/src/content/download/nb120/nb120.asciidoc
index 17e171d..a32f7fd 100644
--- a/netbeans.apache.org/src/content/download/nb120/nb120.asciidoc
+++ b/netbeans.apache.org/src/content/download/nb120/nb120.asciidoc
@@ -87,6 +87,16 @@
- link:https://cwiki.apache.org/confluence/display/NETBEANS/Results+from+Apache+NetBeans+IDE+12.0+Community+Acceptance+survey[Results from Apache NetBeans IDE 12.0 Community Acceptance survey]
+== Known problems
+
+- Maven project may fail to be updated when the pom.xml is changed or dependencies
+ are updated. As a workaround add the commandline option
+ `-J-Dmaven.defaultProjectBuilder.disableGlobalModelCache=true` to the
+ `netbeans_default_options` in the `etc/netbeans.conf` configuration file:
+
+ netbeans_default_options="-J-Dmaven.defaultProjectBuilder.disableGlobalModelCache=true -J-XX:+UseStringDeduplication -J-Xss2m -J-Djdk.gtk.version=2.2 -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dsun.java2d.noddraw=true -J-Dsun.java2d.dpiaware=true -J-Dsun.zip.disableMemoryMapping=true -J-Dplugin.manager.check.updates=false -J-Dnetbeans.extbrowser.manual_chrome_plugin_install=yes -J--add-opens=java.base/java.net=ALL-UNNAMED -J--add-opens=java.base/java.lang.ref=ALL-UNNAMED -J--add-opens=java.base/java.lang=ALL-UNNAMED -J--add-opens=java.base/java.security=ALL-UNNAMED -J--add-opens=java.base/java.util=ALL-UNNAMED -J--add-opens=java.desktop/javax.swing.plaf.basic=ALL-UNNAMED -J--add-opens=java.desktop/javax.swing.text=ALL-UNNAMED -J--add-opens=java.desktop/javax.swing=ALL-UNNAMED -J--add-opens=java.desktop/java.awt=ALL-UNNAMED -J--add-opens=java.desktop/java.awt.event=ALL-UNNAMED -J--add-opens=java.prefs/java.util.prefs=ALL-UNNAMED -J--add-opens=jdk.jshell/jdk.jshell=ALL-UNNAMED -J--add-modules=jdk.jshell -J--add-exports=java.desktop/sun.awt=ALL-UNNAMED -J--add-exports=java.desktop/java.awt.peer=ALL-UNNAMED -J--add-exports=java.desktop/com.sun.beans.editors=ALL-UNNAMED -J--add-exports=java.desktop/sun.swing=ALL-UNNAMED -J--add-exports=java.desktop/sun.awt.im=ALL-UNNAMED -J--add-exports=jdk.internal.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED -J--add-exports=java.management/sun.management=ALL-UNNAMED -J--add-exports=java.base/sun.reflect.annotation=ALL-UNNAMED -J-XX:+IgnoreUnrecognizedVMOptions"
+
+
== Earlier releases
Please visit the link:/download/index.html[Apache NetBeans Download page] for further details.
