Remove BEAM AND REDUCE hop SIZE

[Michele100]

Hi,
I wanted to reduce the size of HOP installation and removed /lib/beam.
But when I started HOP there were some errors.
Is there any document that lists all files that can be removed and if there are some configs to be edited to avoid error messages?
Thanks

[bamaer]

lib/beam and plugins/engines/beam should do it iirc

[Michele100]

Hi @bamaer ,
thanks for your suggestion.
I have removed those 2 folders and few other files from the "core" folder:

And I have the following error when I start hop-gui:
2025/12/11 22:35:16 - General - ERROR: Unexpected error registering jar plugin file: file:/home/michele/hop/plugins/transforms/memgroupby/hop-transform-memgroupby-2.16.0.jar 2025/12/11 22:35:16 - General - ERROR: java.lang.ClassNotFoundException: Unable to load class 'org.apache.hop.pipeline.transforms.memgroupby.MemoryGroupByMeta' in this classloader or in the parent 2025/12/11 22:35:16 - General - at org.apache.hop.core.plugins.HopURLClassLoader.loadClass(HopURLClassLoader.java:97) 2025/12/11 22:35:16 - General - at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) 2025/12/11 22:35:16 - General - at org.apache.hop.core.plugins.BasePluginType.registerPluginJars(BasePluginType.java:586) 2025/12/11 22:35:16 - General - at org.apache.hop.core.plugins.BasePluginType.searchPlugins(BasePluginType.java:119) 2025/12/11 22:35:16 - General - at org.apache.hop.core.plugins.PluginRegistry.registerType(PluginRegistry.java:536) 2025/12/11 22:35:16 - General - at org.apache.hop.core.plugins.PluginRegistry.init(PluginRegistry.java:519) 2025/12/11 22:35:16 - General - at org.apache.hop.core.HopEnvironment.init(HopEnvironment.java:121) 2025/12/11 22:35:16 - General - at org.apache.hop.core.HopEnvironment.init(HopEnvironment.java:77) 2025/12/11 22:35:16 - General - at org.apache.hop.ui.hopgui.HopGui.main(HopGui.java:337) 2025/12/11 22:35:16 - General - Caused by: java.lang.NoClassDefFoundError: org/apache/hop/beam/pipeline/IBeamPipelineTransformHandler 2025/12/11 22:35:16 - General - at java.base/java.lang.ClassLoader.defineClass1(Native Method) 2025/12/11 22:35:16 - General - at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1027) 2025/12/11 22:35:16 - General - at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150) 2025/12/11 22:35:16 - General - at java.base/java.net.URLClassLoader.defineClass(URLClassLoader.java:524) 2025/12/11 22:35:16 - General - at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:427) 2025/12/11 22:35:16 - General - at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:421) 2025/12/11 22:35:16 - General - at java.base/java.security.AccessController.doPrivileged(AccessController.java:714) 2025/12/11 22:35:16 - General - at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:420) 2025/12/11 22:35:16 - General - at org.apache.hop.core.plugins.HopURLClassLoader.loadClassFromThisLoader(HopURLClassLoader.java:67) 2025/12/11 22:35:16 - General - at org.apache.hop.core.plugins.HopURLClassLoader.loadClass(HopURLClassLoader.java:92) 2025/12/11 22:35:16 - General - ... 8 more 2025/12/11 22:35:16 - General - Caused by: java.lang.ClassNotFoundException: Unable to load class 'org.apache.hop.beam.pipeline.IBeamPipelineTransformHandler' in this classloader or in the parent 2025/12/11 22:35:16 - General - at org.apache.hop.core.plugins.HopURLClassLoader.loadClass(HopURLClassLoader.java:97) 2025/12/11 22:35:16 - General - at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) 2025/12/11 22:35:16 - General - ... 18 more 2025/12/11 22:35:16 - General - Caused by: java.lang.ClassNotFoundException: org.apache.hop.beam.pipeline.IBeamPipelineTransformHandler 2025/12/11 22:35:16 - General - at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445) 2025/12/11 22:35:16 - General - at org.apache.hop.core.plugins.HopURLClassLoader.loadClassFromThisLoader(HopURLClassLoader.java:67) 2025/12/11 22:35:16 - General - at org.apache.hop.core.plugins.HopURLClassLoader.loadClass(HopURLClassLoader.java:92) 2025/12/11 22:35:16 - General - ... 19 more
The gui starts and it seems to work OK (not tested much), but my expectations were that I could remove ANY reference to BEAM and still have a functioning HOP, without any errors.
I am aware that this is a very small issue, but maybe it points to some dependencies that should not exists.
Best regards

[hansva]

Those in core can't be removed, that's why they are in core and not in the beam folder.