[KYLIN-4523] Loading HttpContext class twice leads to LinkageError error.

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: v3.1.0
• Sprint: Sprint 51
• Assignee: Zhichao Zhang
• Reporter: Zhichao Zhang
• Created: 26/May/20 12:51
• Updated: 10/Jul/20 11:38
• Resolved: 27/May/20 02:10

Description

After upgrading httpclient to 4.3.6, on CDH 5.7 env it will lead to LinkageError occured, because it loades HttpContext class in two different ClassLoader (CustomizedWebappClassloader and AppClassLoader):

Error message:

java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.http.protocol.HttpCoreContext.<init>(Lorg/apache/http/protocol/HttpContext;)V" the class loader (instance of org/apache/kylin/ext/CustomizedWebappClassloader) of the current class, org/apache/http/client/protocol/HttpClientContext, and the class loader (instance of sun/misc/Launcher$AppClassLoader) for the method's defining class, org/apache/http/protocol/HttpCoreContext, have different Class objects for the type org/apache/http/protocol/HttpContext used in the signature