原文链接

linux（RHEL8）中使用root启动java程序（使用springboot 框架）时可以正常的访问，而当使用非root用户启动springboot 的java 程序时，遇到以下错误：

Identify and stop the process that's listening on port 443 or configure this application to listen on another port.

查看日志后，发现日志中有警告| WARN | main | WebappClassLoaderBase | The web application [ROOT] appears to have started a thread named [HikariPool-1 housekeeper] but has failed to stop it. This is very likely to create a memory leak.，详细的如下：

 2022-05-04 13:01:29.164 | INFO | main | ThreadPoolConfig | Configure task exectuor with corePoolSize = 10, maxPoolsize = 20, queueCapacity = 25
 2022-05-04 13:01:29.168 | INFO | main | ThreadPoolTaskExecutor | Initializing ExecutorService 'taskExecutor'
 2022-05-04 13:01:29.173 | INFO | main | ThreadPoolConfig | Configure task scheduler with poolSize = 4
 2022-05-04 13:01:29.175 | INFO | main | ThreadPoolTaskScheduler | Initializing ExecutorService 'taskScheduler'
 2022-05-04 13:01:30.447 | INFO | main | WelcomePageHandlerMapping | Adding welcome page template: index
 2022-05-04 13:01:31.313 | INFO | main | Http11NioProtocol | Starting ProtocolHandler ["https-jsse-nio-443"]
 2022-05-04 13:01:31.348 | INFO | main | Http11NioProtocol | Pausing ProtocolHandler ["https-jsse-nio-443"]
 2022-05-04 13:01:31.349 | INFO | main | StandardService | Stopping service [Tomcat]
 2022-05-04 13:01:31.355 | WARN | main | WebappClassLoaderBase | The web application [ROOT] appears to have started a thread named [HikariPool-1 housekeeper] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.base@17.0.3/jdk.internal.misc.Unsafe.park(Native Method)
java.base@17.0.3/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:252)
java.base@17.0.3/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1672)
java.base@17.0.3/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1182)
java.base@17.0.3/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:899)
java.base@17.0.3/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1062)
java.base@17.0.3/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1122)
java.base@17.0.3/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
java.base@17.0.3/java.lang.Thread.run(Thread.java:833)

错误原因：

这个java 程序直接使用了443 和 80 端口，没用通过使用像nginx 这样的网关代理到java程序。而一般用户没有权限直接使用这两个端口，就会出现上面的错误。

解决方案：

首先找到java的安装目录：

sudo update-alternatives --config java

如下图示我的java程序安装路径为/usr/lib/jvm/java-17-openjdk-17.0.3.0.6-2.el8_5.x86_64/bin/java

然后，使用setcap配置java让其能够有权限绑定网络端口：

sudo setcap cap_net_bind_service=+ep /usr/lib/jvm/java-17-openjdk-17.0.3.0.6-2.el8_5.x86_64/bin/java

测试下，确保java工作：

java -version

我们发现报错：
java: error while loading shared libraries: libjli.so: cannot open shared object file: No such file or directory

修复这个问题的方式是：
第一步，找到库文件libjli.so的路径，并将器链接到/usr/lib/

sudo ln -s /usr/lib/jvm/java-17-openjdk-17.0.3.0.6-2.el8_5.x86_64/lib/libjli.so /usr/lib/

第二步，执行动态链接库管理命令：

sudo ldconfig

使用java -version测试，成功解决。