Low Description
Based on the log entry below, it seems a custom plugin is attempting on creating log entries with null string.
... INFO | jvm 1 | 2015/06/16 13:43:24 | Caused by: java.lang.NullPointerException INFO | jvm 1 | 2015/06/16 13:43:24 | at com.atlassian.bamboo.v2.build.agent.LogMessageBatchConverter.writeUtf(LogMessageBatchConverter.java:240) INFO | jvm 1 | 2015/06/16 13:43:24 | at com.atlassian.bamboo.v2.build.agent.LogMessageBatchConverter.writeLogEntry(LogMessageBatchConverter.java:143) INFO | jvm 1 | 2015/06/16 13:43:24 | at com.atlassian.bamboo.v2.build.agent.LogMessageBatchConverter.createMessage(LogMessageBatchConverter.java:105) INFO | jvm 1 | 2015/06/16 13:43:24 | at com.atlassian.bamboo.v2.build.agent.LogMessageBatchConverter.toMessage(LogMessageBatchConverter.java:168) INFO | jvm 1 | 2015/06/16 13:43:24 | at com.atlassian.bamboo.v2.build.queue.MessageConverterProxy.toMessage(MessageConverterProxy.java:37) INFO | jvm 1 | 2015/06/16 13:43:24 | at com.atlassian.bamboo.v2.build.queue.BambooMessageConverter.toMessage(BambooMessageConverter.java:59) INFO | jvm 1 | 2015/06/16 13:43:24 | ... 25 more ...
This is probably caused by adding a log entry object with null String for text. Bamboo should be more robust if that happens.