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#17881 closed defect (fixed)
Could not load plugin, main class not found
| Reported by: | Ralpha | Owned by: | Don-vip |
|---|---|---|---|
| Priority: | normal | Milestone: | 19.06 |
| Component: | Core | Version: | |
| Keywords: | template_report, plugin | Cc: |
Description
What steps will reproduce the problem?
- Go to preferences
- Install any plugin (tested with SimplifyArea and Utilsplugin2), click 'Update plugins'
- (everything looks correct up until now)
- Press 'ok'
- Error thrown here
What is the expected result?
That the plugin is enabled and works.
What happens instead?
An error message (on screen and in terminal)
Please provide any additional information below. Attach a screenshot if possible.
Relative:URL: ^/trunk Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b Last:Changed Date: 2019-06-03 00:05:30 +0200 (Mon, 03 Jun 2019) Revision:15155 Build-Date:2019-06-02 22:10:24 URL:https://josm.openstreetmap.de/svn/trunk Identification: JOSM/1.5 (15155 en) Linux Mint 19.1 Tessa Memory Usage: 371 MB / 3000 MB (217 MB allocated, but free) Java version: 11.0.3+7-Ubuntu-1ubuntu218.04.1, Oracle Corporation, OpenJDK 64-Bit Server VM Screen: :0.0 1920x1080, :0.1 1920x1080, :0.2 1920x1080 Maximum Screen Size: 1920x1080 Java package: openjdk-11-jre:amd64-11.0.3+7-1ubuntu2~18.04.1 VM arguments: [-Djosm.restart=true, -Djava.net.useSystemProxies=true] Last errors/warnings: - W: No configuration settings found. Using hardcoded default values for all pools. - W: Region [WMS_BLOCK_v2] Resetting cache - W: Region [WMTS_BLOCK_v2] Resetting cache - W: Invalid jar file ''<josm.pref>/plugins/SimplifyArea.jar.new'' (exists: false, canRead: false) - E: org.openstreetmap.josm.plugins.PluginException: An error occurred in plugin SimplifyArea. Cause: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.simplifyarea.SimplifyAreaPlugin - W: Disable plugin - <html>Could not load plugin 'SimplifyArea' because the plugin<br>main class 'org.openstreetmap.josm.plugins.simplifyarea.SimplifyAreaPlugin' was not found.<br>Delete from preferences?</html> - E: org.openstreetmap.josm.plugins.PluginException: An error occurred in plugin utilsplugin2. Cause: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2 - W: Disable plugin - <html>Could not load plugin 'utilsplugin2' because the plugin<br>main class 'org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2' was not found.<br>Delete from preferences?</html>
Following message will be displayed:
Transcription of image:
Disable plugin - Could not load plugin 'utilsplugin2' because the plugin
main class 'org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2' was not found.
Delete from preferences?
Disable plugin - Keep plugin
Error in terminal:
2019-07-06 23:48:31.012 SEVERE: org.openstreetmap.josm.plugins.PluginException: An error occurred in plugin utilsplugin2. Cause: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2 org.openstreetmap.josm.plugins.PluginException: An error occurred in plugin utilsplugin2 at org.openstreetmap.josm.plugins.PluginInformation.loadClass(PluginInformation.java:382) at org.openstreetmap.josm.plugins.PluginHandler.loadPlugin(PluginHandler.java:801) at org.openstreetmap.josm.plugins.PluginHandler.loadPlugins(PluginHandler.java:890) at org.openstreetmap.josm.gui.preferences.PreferenceTabbedPane$PluginDownloadAfterTask.run(PreferenceTabbedPane.java:172) at org.openstreetmap.josm.gui.preferences.PreferenceTabbedPane.savePreferences(PreferenceTabbedPane.java:428) at org.openstreetmap.josm.gui.preferences.PreferenceDialog$OKAction.actionPerformed(PreferenceDialog.java:202) at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967) at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308) at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405) at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262) at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279) at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297) at java.desktop/java.awt.Component.processMouseEvent(Component.java:6632) at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342) at java.desktop/java.awt.Component.processEvent(Component.java:6397) at java.desktop/java.awt.Container.processEvent(Container.java:2263) at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5008) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840) at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918) at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547) at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307) at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840) at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:117) at java.desktop/java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:190) at java.desktop/java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:235) at java.desktop/java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:233) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.desktop/java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:233) at java.desktop/java.awt.Dialog.show(Dialog.java:1070) at java.desktop/java.awt.Component.show(Component.java:1716) at java.desktop/java.awt.Component.setVisible(Component.java:1663) at java.desktop/java.awt.Window.setVisible(Window.java:1031) at java.desktop/java.awt.Dialog.setVisible(Dialog.java:1005) at org.openstreetmap.josm.gui.preferences.PreferenceDialog.setVisible(PreferenceDialog.java:143) at org.openstreetmap.josm.actions.PreferencesAction.run(PreferencesAction.java:112) at org.openstreetmap.josm.actions.PreferencesAction.actionPerformed(PreferencesAction.java:101) at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967) at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308) at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405) at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262) at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279) at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297) at java.desktop/java.awt.Component.processMouseEvent(Component.java:6632) at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342) at java.desktop/java.awt.Component.processEvent(Component.java:6397) at java.desktop/java.awt.Container.processEvent(Container.java:2263) at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5008) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840) at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918) at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547) at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488) at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307) at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4840) at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90) Caused by: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2 at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588) at org.openstreetmap.josm.plugins.PluginClassLoader.loadClass(PluginClassLoader.java:73) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:398) at org.openstreetmap.josm.plugins.PluginInformation.loadClass(PluginInformation.java:380) ... 87 more 2019-07-06 23:48:31.016 WARNING: Disable plugin - <html>Could not load plugin 'utilsplugin2' because the plugin<br>main class 'org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2' was not found.<br>Delete from preferences?</html>
Tested this with JOSM version 15155 and JOSM version 15214 (latest).
With both JRE 8 and JRE 11
Jar file was not downloaded to ~/.josm/plugins first but later created directory after manualy adding the .josm folder.
Jar files are identical in all locations below.
utilsplugin2.jar:
Last modified: 14/04/2019
sha512sum: c39cdbb3df31b12ce4d78d35022da55d66d3561bf7b1bee2c308a0aed9353b7b74cf6b740a8076b44da2355bc40aa321454be2e52c3042f64b9b9b4b59f4877a
Jar exists in:
~/.josm/plugins/utilsplugin2.jar
~/.local/share/JOSM/plugins/utilsplugin2.jar
~/.local/share/JOSM-latest/plugins/utilsplugin2.jar
This was a clean install from JOSM.
Attachments (0)
Change History (15)
comment:1 by , 5 years ago
| Keywords: | linux mint added |
|---|---|
| Owner: | changed from to |
| Status: | new → needinfo |
comment:2 by , 5 years ago
After removing all folders with preferences, user data and caches I still get the same error.
Also after not being able to install the plugin and then restarting JOSM, I still see it being loaded during startup:
Although it is under 'Removing unmaintained plugins...'
When I remove the file from the filesystem it will not show up on the loading screen. So JOSM does find the file.
I tested some other plugins like 'Create_grid_of_ways' and 'areaselector', they seem to load just fine.
Might the problem be in the plugin? (or version of the plugin?)
comment:3 by , 5 years ago
I did a test on a different system, an old Linux Mint 17.3 system. (most other things are different on this system, different JVM, different software,...)
Also a clean install of JOSM, the same errors.
It downloads the plugin to the right folder.
I think it is a problem with the version of the plugin or something. Or just a problem with Linux Mint (but this seems unlikely)
comment:5 by , 5 years ago
I found the problem.
The problem is with enabling the plugin. When I go and manually change the ~/.config/JOSM/preferences.xml and added:
<list key='plugins'> <entry value='tageditor'/> <entry value='utilsplugin2'/> <--- This line </list>
I can load JOSM with the plugin enabled without and problems.
comment:6 by , 5 years ago
Still you shouldn't have faced the problem. Can you please try to deactivate utilsplugin2, relaunch JOSM r15221+, see if you get the error and copy/paste the error log?
Version 0, edited 5 years ago by (next)
comment:7 by , 5 years ago
Using version 15221:
Java version: 11.0.3
Here the error log:
2019-07-07 15:19:30.769 INFO: Plugins up to date - All installed plugins are up to date. JOSM does not have to download newer versions. 2019-07-07 15:19:32.670 SEVERE: Unable to load class org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2 from plugin utilsplugin2 using classloader PluginClassLoader [urls=[]]: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2 java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2 at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588) at org.openstreetmap.josm.plugins.PluginClassLoader.loadClass(PluginClassLoader.java:73) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:398) at org.openstreetmap.josm.plugins.PluginInformation.loadClass(PluginInformation.java:384) at org.openstreetmap.josm.plugins.PluginHandler.loadPlugin(PluginHandler.java:801) at org.openstreetmap.josm.plugins.PluginHandler.loadPlugins(PluginHandler.java:890) at org.openstreetmap.josm.gui.preferences.PreferenceTabbedPane$PluginDownloadAfterTask.run(PreferenceTabbedPane.java:172) at org.openstreetmap.josm.gui.preferences.PreferenceTabbedPane.savePreferences(PreferenceTabbedPane.java:428) at org.openstreetmap.josm.gui.preferences.PreferenceDialog$OKAction.actionPerformed(PreferenceDialog.java:202)
I think that plugins that do not require a restart of JOSM all give this/simular errors.
comment:8 by , 5 years ago
OK the classloader being empty, there's no chance to load the class:
using classloader PluginClassLoader [urls=[]]
But during my tests I didn't observe the problem. Strange.
comment:11 by , 5 years ago
Version 15224 does not seem to solve the issue.
Error looks the same.
$ josm-latest
Using /usr/lib/jvm/java-11-openjdk-amd64/bin/java to execute josm-latest.
2019-07-07 18:00:08.897 INFO: Log level is at INFO (INFO, 800)
Warning: Nashorn engine is planned to be removed from a future JDK release
Warning: Nashorn engine is planned to be removed from a future JDK release
2019-07-07 18:00:16.160 WARNING: No configuration settings found. Using hardcoded default values for all pools.
2019-07-07 18:00:16.475 INFO: Changeset updater active (checks every 60 minutes if open changesets have been closed)
2019-07-07 18:00:20.423 WARNING: Region [WMS_BLOCK_v2] Resetting cache
2019-07-07 18:00:20.431 WARNING: Region [WMTS_BLOCK_v2] Resetting cache
2019-07-07 18:00:20.481 INFO: Defaults for draw.rawgps.layer.wpt.pattern differ: ?{ '{name} ({desc})' | '{name} ({cmt})' | '{name}' | '{desc}' | '{cmt}' } !=
2019-07-07 18:00:20.484 INFO: Defaults for draw.rawgps.layer.audiowpt.pattern differ: ?{ '{name}' | '{desc}' | '{formattedWaypointOffset}' } !=
2019-07-07 18:00:30.899 INFO: GET https://josm.openstreetmap.de/pluginicons -> 200
2019-07-07 18:00:32.243 INFO: Plugins up to date - All installed plugins are up to date. JOSM does not have to download newer versions.
2019-07-07 17:45:28.601 SEVERE: Unable to load class org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2 from plugin utilsplugin2 using classloader PluginClassLoader [urls=[]]: java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2
java.lang.ClassNotFoundException: org.openstreetmap.josm.plugins.utilsplugin2.UtilsPlugin2
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
at org.openstreetmap.josm.plugins.PluginClassLoader.loadClass(PluginClassLoader.java:73)
...
This may help with reproducing the error, a screen recording of version 15224: https://youtu.be/EayBIsFRZwU
comment:12 by , 5 years ago
| Component: | Plugin → Core |
|---|---|
| Keywords: | linux mint removed |
| Milestone: | → 19.06 |
| Owner: | changed from to |
| Status: | needinfo → assigned |
Thanks for the video, I can reproduce now.
comment:14 by , 5 years ago
I needed to remove all the settings (or some part of it, maybe the plugin .jar only, don't know):
~/.local/share/JOSM
~/.config/JOSM
But after that, I tested with version 15234 and the problem is solved.
Thanks Don-vip.
2019-07-08 15:20:33.879 INFO: Update plugins - <html>The following plugin has been downloaded <strong>successfully</strong>:<ul><li>utilsplugin2 (34977)</li></ul></html> 2019-07-08 15:20:36.846 INFO: loading plugin 'utilsplugin2' (version 34977)
Note:
See TracTickets
for help on using tickets.
You shouldn't have 3 copies of the plugin. Try to delete everything and get a clean environment by downloading plugins again from JOSM. They should be downloaded once in
$HOME/.local/share/JOSMor$HOME/.local/share/JOSM-latest(please choose a single version too), see Help/Preferences#Linux