# Wowza - Plugin activation - Stream target list gets empty... solution ? **URL:** \ **Category:** Wowza Developer Dojo\ **Tags:** wowza-streaming-server-java-api\ **Created:** [October 19, 2016, 12:51am UTC](https://community.wowza.com/t/wowza-plugin-activation-stream-target-list-gets-empty-solution/47620 "2016-10-19T00:51:28Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Max\_Mustermann](https://avatars.discourse-cdn.com/v4/letter/m/fbc32d/32.png) [@Max\_Mustermann](https://community.wowza.com/u/Max_Mustermann)\ **Post date:** [October 19, 2016, 12:51am UTC](https://community.wowza.com/t/wowza-plugin-activation-stream-target-list-gets-empty-solution/47620/1 "2016-10-19T00:51:28Z")
Hello, i am developing a Plugin for Streaming for our wowza-servers and its working as intended, but has 1 little problem. When i use the my plugin on our main wowza-server all the configurated stream-targets disappear. I am trying to figure out the main reason for the problem, but right now i was able to identify some more detail about the problem, but was not able to solve it. Maybe someone here has an idea. == Problem is: - My module extends HttpProvider & is compiled as a jar-file, which i put into the /lib-folder. - after i activate the class with full qualified package name & class-name =\> all stream targets disappear after server restart - btw. the module is running without any problem on another server, where no stream targets are setup == To keep the problem simple: I searched for an existing officially Plugin using HttpProvider including the official source. So i found [Official Blacklist-Plugin](https://www.wowza.com/docs/how-to-blacklist-a-stream-in-session-blackliststreams%28BlacklistStreams%29) using the precompiled [Jar (inside zip)](https://www.wowza.com/downloads/forums/collection/wse-plugin-blackliststreams.zip) everything works fine. But when i just recreate the project (using [Offficial Git-Source](https://github.com/WowzaMediaSystems/wse-plugin-blackliststreams)) and compiling it all on my own and putting this compiled jar-file into the /lib-folder the stream targets disappear. VHost.xml-config is as [mentioned here](https://www.wowza.com/docs/how-to-blacklist-a-stream-in-session-blackliststreams%28BlacklistStreams%29). == In Detail: Wowza-Server: Wowza Streaming Engine 4 Monthly Edition 4.5.0.02 build19165 Wowza-Server-Config: has Stream-Targets setup No Problem: using precompiled Blacklist-Plugin-Jar-File Problem: compiling Blacklist-Plugin on my own & using this Jar-File all stream targets disappear in the wowza-engine-manager The server was running wowza 4.30 before with plugins & configurations. We updated it to the newest 4.5.0.0.2 version, but the problem is not yet solved (Stream-Target-List is empty, after server restart). When i look inside the /logs/wowzastreamingengine\_error.log: ```auto #Version: 1.0 #Start-Date: 2016-10-19 10:10:05 CEST #Software: Wowza Streaming Engine 4.5.0.02 build19165 #Date: 2016-10-19 #Fields: x-severity x-category x-event date time c-client-id c-ip c-port cs-bytes sc-bytes x-duration x-sname x-stream-id x-spos sc-stream-bytes cs-stream-bytes x-file-size x-file-length x-ctx x-comment ERROR server comment 2016-10-19 10:10:15 - - - - - 9.97 - - - - - - - - PushPublisherManager.getPushPublisherModule[wd]: Error accessing ModulePushPublish null: java.lang.NullPointerException |at com.wowza.wms.pushpublish.manager.PushPublishManager.a(PushPublishManager.java:390) |at com.wowza.wms.pushpublish.manager.PushPublishManager.a(PushPublishManager.java:347) |at com.wowza.wms.pushpublish.manager.PushPublishManager.getEntries(PushPublishManager.java:100) |at com.wowza.wms.rest.vhosts.applications.pushpublish.PushPublishStreamsAppConfig.loadObject(Unknown Source) |at com.wowza.wms.rest.ConfigBase.get(Unknown Source) | ERROR server comment 2016-10-19 10:10:33 - - - - - 28.542 - - - - - - - - Problem shutting down : java.lang.NullPointerException |at com.wowza.wms.vhost.VHost.shutdown(VHost.java:644) |at com.wowza.wms.vhost.VHostSingleton.shutdown(VHostSingleton.java:91) |at com.wowza.wms.server.Server.stopVHost(Server.java:3491) |at com.wowza.wms.server.Server.stopVHosts(Server.java:3509) |at com.wowza.wms.server.Server.stopServer(Server.java:1170) | ``` First of all i thaught about special server settings, but this shouldn´t be the problem, because the precompiled official-blacklist-plugin-jarfile is working. The only difference i could think of can be the compilation settings. The official plugin is compiled with an older version. My compilation (of the official git-hub-src) is using wowza 4.5.0.0.2 (like the version on our server) using eclipse with wowza-ide-2. Right now, i don´t have any idea. Any ideas are appreciated. Thank you. ---
**Author:** ![Michelle\_B](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/michelle_b/32/394_2.png) [@Michelle\_B](https://community.wowza.com/u/Michelle_B)\ **Post date:** [December 22, 2016, 3:54pm UTC](https://community.wowza.com/t/wowza-plugin-activation-stream-target-list-gets-empty-solution/47620/2 "2016-12-22T15:54:41Z")
Hi, You should be using [Wowza IDE 4](https://www.wowza.com/docs/how-to-extend-wowza-streaming-engine-using-the-wowza-ide) plugin, as this is compatible with the Wowza version that you have. Please use this plugin and see if you continue to have issues. Michelle ---
**Author:** ![Max\_Mustermann](https://avatars.discourse-cdn.com/v4/letter/m/fbc32d/32.png) [@Max\_Mustermann](https://community.wowza.com/u/Max_Mustermann)\ **Post date:** [October 19, 2016, 3:02am UTC](https://community.wowza.com/t/wowza-plugin-activation-stream-target-list-gets-empty-solution/47620/3 "2016-10-19T03:02:57Z")
After some more testing, i finally found the solution. In Eclipse-IDE (with Wowza-IDE-2-Plugin) on Project-Settings \> Java Compiler: - Enable Project specific settings: yes - Compiler compliance Level: 1.7 (was previously 1.8) So compiling the wowza-plugin.jar with Java 1.8, caused the error-log-entry above, so the “Stream Targets”-list got empty. _solved - thread can be closed_ EDIT: ops, i just saw… i posted it into the wrong sub-forum. Please move to Java Subforum.