[GitHub] LeoAugust19 opened a new issue #2134: java.lang.NoClassDefFoundError in com.alibaba:dubbo-rpc-thrift, due dependency conflict issue

[GitBox <gi...@apache.org>]

LeoAugust19 opened a new issue #2134: java.lang.NoClassDefFoundError in com.alibaba:dubbo-rpc-thrift, due dependency conflict issue
URL: https://github.com/apache/incubator-dubbo/issues/2134
 
 
   ### Environment
   * Dubbo version: com.alibaba:dubbo-rpc-thrift:jar:2.6.2
   * Operating System version: Windows
   * Java version: Jdk 1.7
   
   ### Descirption
   Hi, there are two versions of **org.apache.httpcomponents:httpcore:jar** exist in com.alibaba:dubbo-rpc-thrift, and only **org.apache.httpcomponents:httpcore:jar:4.1.3** can be loaded during packaging process based on "nearest wins strategy". However, **class org.apache.http.util.Args** only included in **org.apache.httpcomponents:httpcore:jar:4.4.6:compile** which is shadowed by Maven. When your project referencing the missing class, java.lang.NoClassDefFoundError will be thrown.
   
   
   ### Dependency tree
   com.alibaba:dubbo-rpc-thrift:jar:2.6.2
   +- com.alibaba:dubbo-rpc-api:jar:2.6.2:compile
   +- org.apache.thrift:libthrift:jar:0.8.0:compile
   |  +- org.slf4j:slf4j-api:jar:1.7.25:compile (version managed from 1.5.8)
   |  +- commons-lang:commons-lang:jar:2.5:compile
   |  +- org.apache.httpcomponents:httpclient:jar:4.5.3:compile (version managed from 4.1.2)
   |  |  +- (org.apache.httpcomponents:httpcore:jar:4.4.6:compile - **omitted for conflict with 4.1.3**)
   |  |  +- (commons-logging:commons-logging:jar:1.2:compile - version managed from 1.1.1; omitted for duplicate)
   |  |  \- commons-codec:commons-codec:jar:1.9:compile
   |  \- org.apache.httpcomponents:httpcore:jar:4.1.3:compile
   
   ### Test case:
   [RandomAccessByteArrayOutputStreamTest.txt](https://github.com/apache/incubator-dubbo/files/2228066/RandomAccessByteArrayOutputStreamTest.txt)
   
   As the automatic test case generation tool can not deal with complex conditions, so before analyzing the source file, we mutated the program to allow-----
   
   OutputStream out = new org.apache.http.impl.conn.LoggingOutputStream(new java.io.FileOutputStream("D:\\test.txt"),new org.apache.http.impl.conn.Wire(null));
   
   in 
    method com.alibaba.dubbo.rpc.protocol.thrift.io.RandomAccessByteArrayOutputStream.writeTo(RandomAccessByteArrayOutputStream.java:93)
   
   which is a reasonable condition. 
   
   Then we got the following stack trace.
   
   ### Stack trace:
   Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/util/Args
   	at org.apache.http.impl.conn.Wire.output(Wire.java:110)
   	at org.apache.http.impl.conn.LoggingOutputStream.write(LoggingOutputStream.java:73)
   	at com.alibaba.dubbo.rpc.protocol.thrift.io.RandomAccessByteArrayOutputStream.writeTo(RandomAccessByteArrayOutputStream.java:93)
   	at com.alibaba.dubbo.rpc.protocol.thrift.io.RandomAccessByteArrayOutputStreamTest.main(RandomAccessByteArrayOutputStreamTest.java:11)
   Caused by: java.lang.ClassNotFoundException: org.apache.http.util.Args
   	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
   	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
   	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
   	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
   	... 4 more
   
   
   
   ### Suggested solution
   I found that you only deal with the dependency conflict issue for httpclient in version mangement file.
   Could you please set the version of httpcore to 4.4.6 (dependencyManagement) in pom.xml?
   

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