I am not able to read data from the ROS file

Question

Preeti Sar 2015-12-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260814-i-am-not-able-to-read-data-from-the-ros-file

回答： Tohru Kikawada 2019-5-2

 msgs = readMessages(bag)
Error using robotics.ros.BagSelection/deserializeMessages (line 444)
Java exception occurred:
org.ros.exception.RosMessageRuntimeException: java.lang.ClassNotFoundException: rt_msgs.Odom
  at org.ros.internal.message.definition.MessageDefinitionReflectionProvider.get(MessageDefinitionReflectionProvider.java:66)
  at org.ros.internal.message.DefaultMessageFactory.newFromType(DefaultMessageFactory.java:42)
  at org.ros.internal.message.DefaultMessageDeserializer.deserialize(DefaultMessageDeserializer.java:42)
Caused by: java.lang.ClassNotFoundException: rt_msgs.Odom
  at java.net.URLClassLoader$1.run(Unknown Source)
  at java.net.URLClassLoader$1.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.net.URLClassLoader.findClass(Unknown Source)
  at java.lang.ClassLoader.loadClass(Unknown Source)
  at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
  at java.lang.ClassLoader.loadClass(Unknown Source)
  at org.ros.internal.message.definition.MessageDefinitionReflectionProvider.get(MessageDefinitionReflectionProvider.java:62)
  ... 2 more
Error in robotics.ros.BagSelection/readMessages (line 194)
            msgs = obj.deserializeMessages(obj.MessageList, rows);

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Image Analyst 2015-12-18

Personally, I'd call the Mathworks technical support for any Java related errors. Make sure you have the latest Java release - or maybe not - that might be the problem. Who knows?

Ahmad Drak 2016-4-25