Howdy, Stranger!
We are about to switch to a new forum software. Until then we have removed the registration on this forum.
Categories
- All Categories 25.7K
- Announcements & Guidelines 13
- Common Questions 30
- Using Processing 22.1K
- Programming Questions 12.2K
- Questions about Code 6.4K
- How To... 4.2K
- Hello Processing 72
- GLSL / Shaders 292
- Library Questions 4K
- Hardware, Integration & Other Languages 2.7K
- Kinect 668
- Arduino 1K
- Raspberry PI 188
- Questions about Modes 2K
- Android Mode 1.3K
- JavaScript Mode 413
- Python Mode 205
- Questions about Tools 100
- Espanol 5
- Developing Processing 548
- Create & Announce Libraries 211
- Create & Announce Modes 19
- Create & Announce Tools 29
- Summer of Code 2018 93
- Rails Girls Summer of Code 2017 3
- Summer of Code 2017 49
- Summer of Code 2016 4
- Summer of Code 2015 40
- Summer of Code 2014 22
- p5.js 1.6K
- p5.js Programming Questions 947
- p5.js Library Questions 315
- p5.js Development Questions 31
- General 1.4K
- Events & Opportunities 288
- General Discussion 365
In this Discussion
- subject117 August 2016
Processing crashes on startup
I just downloaded the 3.1.1 version of Processing but I can't get it to run. It crashes on startup. I see the splash screen and immediately after I see a NullPointerException error message. I also see this on the console:
err is java.lang.NoSuchMethodError: processing.data.StringList.([Ljava/lang/Object;)V
the exception is:
java.lang.NullPointerException at processing.app.Base.buildCoreModes(Base.java:357) at processing.app.Base.(Base.java:273) at processing.app.Base.createAndShowGUI(Base:201) ....
I tried eliminating the .processing directory, which contains the preferences.txt file. I read elsewhere that eliminating that can fix some startup problems. This didn't work in this case though.
This works just fine on my other computer but I can't figure out what is different. Any suggestions?
Answers
I found this issue on github:
https://github.com/processing/processing/issues/4128
Same exact error message. Glad I am not alone.
I found the reason and a solution!
The problem was my Java CLASSPATH. For reasons related to a project I did a few years ago, I had a set of Processing jar files (probably 2.2.1) in a directory that was always in my CLASSPATH. I realize now that this is not a good idea but it made sense at the time.
When the Processing startup script runs it adds its own files and directories to the end of the CLASSPATH before launching the application. Since my other set of Processing jar files were ahead of the correct jar files, the JRE would load classes from those jars first. Not surprisingly, that is bad for Processing.
To fix it, I simply had to simply remove my addition to my CLASSPATH. It worked right away after that.