Problem

Whenever a Remote Agent tries to connect to the Bamboo server, the connection fails with an error:

org.apache.http.ConnectionClosedException: Premature end of Content-Length delimited message body (expected: 5.001; received: 42) 

Environment

• Bamboo 9.4.0 (not reproducible on 9.3.x and earlier)
• Remote Agents, possibly ephemeral
• HTTP compression is enabled on the Bamboo Server or Reverse Proxy/Load Balancer

Steps to Reproduce

1. Enable compression on the Tomcat connector in Bamboo:

   <Connector
       port="8085"
       protocol="HTTP/1.1"
   ...	
       compression="on"
   

2. Make sure that text/plain is listed on the Connector's compressableMimeType property:

       compression="on"
       compressableMimeType="text/html,text/xml,text/plain,text/css,application/json,application/javascript,application/x-javascript"
   

3. Point a Remote Agent to Bamboo and observe the logs

Expected Results

• The Agent should connect normally and understand compressed responses normally.

Actual Results

• The Agent expects the uncompressed response and fails in case it is compressed. It reports the following error and stack trace:

  INFO   | jvm 1    | 2023/10/28 22:41:48 | 2023-10-28 22:41:48,004 INFO [WrapperSimpleAppMain] [RemoteAgentHomeLocatorForBootstrap] Using agent home located at [/home/bamboo/bamboo-agent-home]
  INFO   | jvm 1    | 2023/10/28 22:42:48 | Exiting due to fatal exception.
  INFO   | jvm 1    | 2023/10/28 22:42:48 | org.apache.http.ConnectionClosedException: Premature end of Content-Length delimited message body (expected: 5.002; received: 43)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.impl.io.ContentLengthInputStream.read(ContentLengthInputStream.java:178)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.impl.io.ContentLengthInputStream.read(ContentLengthInputStream.java:198)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.impl.io.ContentLengthInputStream.close(ContentLengthInputStream.java:101)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.impl.execchain.ResponseEntityProxy.streamClosed(ResponseEntityProxy.java:142)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.conn.EofSensorInputStream.checkClose(EofSensorInputStream.java:228)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.conn.EofSensorInputStream.close(EofSensorInputStream.java:172)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/java.util.zip.InflaterInputStream.close(InflaterInputStream.java:231)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/java.util.zip.GZIPInputStream.close(GZIPInputStream.java:136)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.client.entity.LazyDecompressingInputStream.close(LazyDecompressingInputStream.java:94)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.util.EntityUtils.toString(EntityUtils.java:232)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.util.EntityUtils.toString(EntityUtils.java:270)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at com.atlassian.bamboo.agent.bootstrap.ClasspathBuilder.lambda$testCaching$1(ClasspathBuilder.java:76)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:223)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:165)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:140)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at com.atlassian.bamboo.agent.bootstrap.ClasspathBuilder.testCaching(ClasspathBuilder.java:76)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at com.atlassian.bamboo.agent.bootstrap.ClasspathBuilder.getClassLoader(ClasspathBuilder.java:61)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at com.atlassian.bamboo.agent.bootstrap.AgentContext.newClassLoader(AgentContext.java:371)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at com.atlassian.bamboo.agent.bootstrap.AgentContext.run(AgentContext.java:121)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at com.atlassian.bamboo.agent.bootstrap.RemoteAgentBootstrap.run(RemoteAgentBootstrap.java:163)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at com.atlassian.bamboo.agent.bootstrap.RemoteAgentBootstrap.main(RemoteAgentBootstrap.java:71)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at com.atlassian.bamboo.agent.bootstrap.AgentBootstrap.main(AgentBootstrap.java:21)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at org.tanukisoftware.wrapper.WrapperSimpleApp.run(WrapperSimpleApp.java:349)
  INFO   | jvm 1    | 2023/10/28 22:42:48 | 	at java.base/java.lang.Thread.run(Thread.java:833)
  

Workaround

1. Either disable compression completely on server.xml or remove text/plain from the compressableMimeType property and restart the server.
   or
2. As this issue is caused by an external bug/regression in Apache Tomcat 9.0.81, you can upgrade the Apache Tomcat version used by Bamboo to 9.0.82 or later manually to fix the issue until a Bamboo version is released with an updated Tomcat version.

Notes

• Apache Tomcat BZ: Bug 67670 - 20 seconds to download some JS files with 9.0.81