Maven 在编译期间卡住

Question

我正在使用 mvn clean install 命令，似乎 maven 在编译类时陷入了一些死锁，它保持在这种状态 -

    [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ service-nextgen ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 4 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.6.1:compile (default-compile) @ service-nextgen ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 363 source files to C:\Users\service-nextgen\target\classes

如果我使用 java Visual VM 可视化线程转储，我会得到以下信息：

"RMI TCP Connection(3)-3.202.32.1" #20 daemon prio=5 os_prio=0 tid=0x000000001f246000 nid=0x2454 runnable [0x000000002118e000]
   java.lang.Thread.State: RUNNABLE
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.read(SocketInputStream.java:150)
    at java.net.SocketInputStream.read(SocketInputStream.java:121)
    at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
    at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
    - locked <0x00000000ff832010> (a java.io.BufferedInputStream)
    at java.io.FilterInputStream.read(FilterInputStream.java:83)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:550)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$240(TCPTransport.java:683)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$$Lambda$2/10873147.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

   Locked ownable synchronizers:
    - <0x00000000ff8321d0> (a java.util.concurrent.ThreadPoolExecutor$Worker)


"main" #1 prio=5 os_prio=0 tid=0x0000000001ff8000 nid=0x2b38 runnable [0x0000000002501000]
   java.lang.Thread.State: RUNNABLE
    at java.lang.Object.hashCode(Native Method)
    at java.util.HashMap.hash(HashMap.java:338)
    at java.util.HashMap.get(HashMap.java:556)
    at com.sun.tools.javac.comp.Infer$InferenceContext.cachedCapture(Infer.java:2309)

不知道如何找到根本原因。

Answer 1

在 maven 编译器插件中添加 Compiler args 后，我能够确定问题：<compilerArgs> <arg>-verbose</arg> <arg>-Xlint:all,-options,-path</arg> </compilerArgs>这在编译过程中一一显示了类，我能够看到编译器卡住的地方。

Maven 配置如下所示：

<project>
  [...]
  <build>
    [...]
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.7.0</version>
        <configuration>
          <compilerArgs>
            <arg>-verbose</arg>
            <arg>-Xlint:all,-options,-path</arg>
          </compilerArgs>
        </configuration>
      </plugin>
    </plugins>
    [...]
  </build>
  [...]
</project>

此类错误的一类可能的罪魁祸首是在编译阶段生成代码的注释处理器。