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最近在环境中定位服务问题，由于服务使用的docker部署的，且使用的docker镜像，在启动之后，容器内没有jdk相关的工具【jstat、jmap等等】；于是采用 在项目中使用java类获取jvm相关信息，以下是测试的示例：
import java.lang.management.managementfactory;
import java.lang.management.memorymxbean;
import java.lang.management.memoryusage;
import java.lang.management.garbagecollectormxbean;
import java.lang.management.memorypoolmxbean;
import java.lang.management.threadmxbean;
import java.util.list;
public class gcinfodemo {
public static void main(string[] args) {
// 获取内存管理 bean
memorymxbean memorymxbean = managementfactory.getmemorymxbean();
memoryusage heapmemoryusage = memorymxbean.getheapmemoryusage();
memoryusage nonheapmemoryusage = memorymxbean.getnonheapmemoryusage();
// 打印内存信息
system.out.println("heap memory usage:");
system.out.println(" init: " + heapmemoryusage.getinit() / (1024 * 1024) + " mb");
system.out.println(" used: " + heapmemoryusage.getused() / (1024 * 1024) + " mb");
system.out.println(" committed: " + heapmemoryusage.getcommitted() / (1024 * 1024) + " mb");
system.out.println(" max: " + heapmemoryusage.getmax() / (1024 * 1024) + " mb");
system.out.println("\nnon-heap memory usage:");
system.out.println(" init: " + nonheapmemoryusage.getinit() / (1024 * 1024) + " mb");
system.out.println(" used: " + nonheapmemoryusage.getused() / (1024 * 1024) + " mb");
system.out.println(" committed: " + nonheapmemoryusage.getcommitted() / (1024 * 1024) + " mb");
system.out.println(" max: " + nonheapmemoryusage.getmax() / (1024 * 1024) + " mb");
// 获取垃圾回收回收器 bean 的列表
list<garbagecollectormxbean> gcbeans = managementfactory.getgarbagecollectormxbeans();
system.out.println("\ngarbage collectors:");
for (garbagecollectormxbean gcbean : gcbeans) {
system.out.println(" name: " + gcbean.getname());
system.out.println(" number of collections: " + gcbean.getcollectioncount());
system.out.println(" total time spent in collections: " + gcbean.getcollectiontime() + " ms");
}
// 打印内存池信息
system.out.println("\nmemory pools:");
for (memorypoolmxbean memorypool : managementfactory.getmemorypoolmxbeans()) {
system.out.println(" name: " + memorypool.getname());
system.out.println(" usage: " + memorypool.getusage());
}
// 获取线程管理 bean
threadmxbean threadmxbean = managementfactory.getthreadmxbean();
// 获取所有线程 id
long[] threadids = threadmxbean.getallthreadids();
system.out.println("\nthreads information:");
for (long threadid : threadids) {
system.out.println(" thread id: " + threadid);
system.out.println(" thread name: " + threadmxbean.getthreadinfo(threadid).getthreadname());
system.out.println(" thread state: " + threadmxbean.getthreadinfo(threadid).getthreadstate());
}
// 检查死锁线程
long[] deadlockedthreads = threadmxbean.finddeadlockedthreads();
if (deadlockedthreads != null) {
system.out.println("\ndeadlocked threads:");
for (long deadlockedthreadid : deadlockedthreads) {
system.out.println(" deadlocked thread id: " + deadlockedthreadid);
system.out.println(" thread name: " + threadmxbean.getthreadinfo(deadlockedthreadid).getthreadname());
}
} else {
system.out.println("\nno deadlocked threads found.");
}
}
}获取gc信息
通过
managementfactory.getgarbagecollectormxbeans()获取所有垃圾回收器的监控bean。每个
garbagecollectormxbean提供：getname()：gc算法名称（如g1 young generation）getcollectioncount()：回收次数getcollectiontime()：累计耗时（毫秒）
2.打印当前线程信息：
- 使用
threadmxbean获取当前线程的所有 id，并通过getthreadinfo方法获取每个线程的信息，包括线程名字和状态。
- 使用
3.检查死锁线程：
- 使用
finddeadlockedthreads方法检查 jvm 中的死锁情况。如果有死锁线程，则输出这些线程的 id 和名称。如果没有，则输出相应的消息。
- 使用
heap memory usage: init: 508 mb used: 10 mb committed: 487 mb max: 7205 mb non-heap memory usage: init: 2 mb used: 4 mb committed: 7 mb max: 0 mb garbage collectors: name: ps scavenge number of collections: 0 total time spent in collections: 0 ms name: ps marksweep number of collections: 0 total time spent in collections: 0 ms memory pools: name: code cache usage: init = 2555904(2496k) used = 1235968(1207k) committed = 2555904(2496k) max = 251658240(245760k) name: metaspace usage: init = 0(0k) used = 3597432(3513k) committed = 4980736(4864k) max = -1(-1k) name: compressed class space usage: init = 0(0k) used = 392584(383k) committed = 524288(512k) max = 1073741824(1048576k) name: ps eden space usage: init = 133169152(130048k) used = 10914704(10658k) committed = 133169152(130048k) max = 2789212160(2723840k) name: ps survivor space usage: init = 22020096(21504k) used = 0(0k) committed = 22020096(21504k) max = 22020096(21504k) name: ps old gen usage: init = 355467264(347136k) used = 0(0k) committed = 355467264(347136k) max = 5666504704(5533696k) threads information: thread id: 6 thread name: monitor ctrl-break thread state: runnable thread id: 5 thread name: attach listener thread state: runnable thread id: 4 thread name: signal dispatcher thread state: runnable thread id: 3 thread name: finalizer thread state: waiting thread id: 2 thread name: reference handler thread state: waiting thread id: 1 thread name: main thread state: runnable no deadlocked threads found. process finished with exit code 0
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