启动Apache FTP Server时出现NoSuchMethodError错误求助

错误信息 #

java.lang.NoSuchMethodError: No virtual method supportedOptions()Ljava/util/Set; in class Ljava/nio/channels/ServerSocketChannel; or its super classes (declaration of 'java.nio.channels.ServerSocketChannel' appears in /system/framework/core-libart.jar)
            at org.apache.mina.transport.socket.nio.NioSocketAcceptor.open(NioSocketAcceptor.java:259)
            at org.apache.mina.transport.socket.nio.NioSocketAcceptor.open(NioSocketAcceptor.java:52)
            at org.apache.mina.core.polling.AbstractPollingIoAcceptor$Acceptor.registerHandles(AbstractPollingIoAcceptor.java:591)
            at org.apache.mina.core.polling.AbstractPollingIoAcceptor$Acceptor.run(AbstractPollingIoAcceptor.java:460)
            at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
            at java.lang.Thread.run(Thread.java:833)

当前依赖 #

implementation 'org.apache.mina:mina-core:2.1.6'
implementation 'org.slf4j:slf4j-api:2.0.6'
implementation 'org.slf4j:slf4j-simple:2.0.6'
implementation 'org.apache.ftpserver:ftplet-api:1.2.0'
implementation 'org.apache.ftpserver:ftpserver-core:1.2.0'

问题原因 #

ServerSocketChannel.supportedOptions()是Java 7新增的方法，你的运行环境（从路径/system/framework/core-libart.jar判断为Android或低版本Java）不支持该方法。Apache Mina 2.1.6要求最低Java版本为Java 8，与你的运行环境版本不兼容，导致抛出该错误。

解决方案 #

• 降级Mina版本：改用支持Java 6+的Mina 2.0.x系列，该分支不会调用supportedOptions()方法。修改Mina依赖为：

  implementation 'org.apache.mina:mina-core:2.0.26'
  

• 兼容性验证：Apache FTPServer 1.2.0兼容Mina 2.x系列，降级Mina版本后无需修改ftpserver相关依赖。
• 环境适配：如果是Android项目，确保编译和运行的API级别不低于19（Android 4.4），以满足Mina 2.0.x的运行要求。

内容的提问来源于stack exchange，提问作者ShaRy