Error Compiling Netty latest (Master) version

Question

I would like to test some of the latest features locate in netty Master branch at github. (git://github.com/netty/netty.git)

I'm doing the following steps:

Open new empty directory on my local machine
Type git init
Type git pull git://github.com/netty/netty.git
Compile pom.xml using maven as follow: mvn clean package

I now get the following compliation error:

[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 13.855s
[INFO] Finished at: Sun Jan 08 12:14:21 IST 2012
[INFO] Final Memory: 16M/176M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project netty: Compilation failure: Compilation
 failure:
[ERROR] \tradair\tools\netty\src\main\java\io\netty\util\internal\LegacyLinkedTransferQueue.java:[655,61] type parameters of <E>E cannot be determined; no uniqu
e maximal instance exists for type variable E with upper bounds E,java.lang.Object
[ERROR] \tradair\tools\netty\src\main\java\io\netty\util\internal\LegacyLinkedTransferQueue.java:[739,53] type parameters of <E>E cannot be determined; no uniqu
e maximal instance exists for type variable E with upper bounds E,java.lang.Object
[ERROR] \tradair\tools\netty\src\main\java\io\netty\util\internal\LegacyLinkedTransferQueue.java:[827,57] type parameters of <E>E cannot be determined; no uniqu
e maximal instance exists for type variable E with upper bounds E,java.lang.Object
[ERROR] \tradair\tools\netty\src\main\java\io\netty\util\internal\LegacyLinkedTransferQueue.java:[880,65] type parameters of <E>E cannot be determined; no uniqu
e maximal instance exists for type variable E with upper bounds E,java.lang.Object

Can you please advise what I'm doing wrong.

I don't see such an error when I tried it. It ends in a failure however not because of compilation errors as in your case. The failure I see are in the unit tests. I am using Maven 3.0.3 with Java 6. A minor side note: The idiomatic recipe for downloading and building netty is to simply:git clone git://github.com/netty/netty.git. You don't have to git init and git pull. — Sri Sankaran
You are correct about git!!! Any other ideas on how to compile the latest version? — Tamir Klein

Jestan Nirojan Jestan Nirojan · Accepted Answer · 2012-01-08T15:33:29

LinkedTransferQueue back-porting was done recently in master, so you better try with latest version of JDK 6, (>= 1.6.0_25, a compiler bug?)

Error Compiling Netty latest (Master) version

2 Answers