咱們常常碰到一些定時任務卡死或者執行時間很長，這樣的問題咱們排查手段比較經常使用的是jstack命令html
來查看線程堆棧，而後根據咱們監控中的threadId或者threadName來查找線程詳細堆棧看卡在哪一個方法。java
經常使用命令以下：chrome
jstack pid >jstack.logapp
如今咱們能夠提供界面查看卡死線程堆棧ui
controller代碼線程
@RequestMapping("/getStackTrace")
@ResponseBody
public String getStackStace(HttpServletRequest request, HttpServletResponse response) {
logger.debug("執行選擇的Job對象 queryQuartzLog quartzLog:");
try {
String threadId=request.getParameter("threadId");
if(StringUtils.isBlank(threadId)){
return "";
}
ThreadInfo info = ThreadUtilities.getExtendThreadInfo(Long.valueOf(threadId));
List<String> list=new ArrayList<String>();
StackTraceElement[] st=info.getStackTrace();
int index=0;
MonitorInfo[] monitors=info.getLockedMonitors();
for(StackTraceElement e:st){
StringBuffer sb=new StringBuffer();
if(index>0){
sb.append(" <- ");
sb.append(System.getProperty("line.separator"));
}
sb.append(e.toString()+ "\n");
list.add(sb.toString());
if (monitors != null) {
for (MonitorInfo mi : monitors) {
if (mi.getLockedStackDepth() == index) {
list.add(" <- - locked "+mi.toString());
}
}
}
index++;
}
return generateHtml("vm/getStackTrace.vm", list);
} catch (Exception e) {
logger.error("doRunQuartzJob 執行選擇的Job對象出錯", e);
return "fail";
}
}
ThreadUtilities.getExtendThreadInfodebug
public static ThreadInfo getExtendThreadInfo(final long threadID) {
ThreadInfo ti = null;
final ThreadMXBean threadMBean = ManagementFactory.getThreadMXBean();
if (threadMBean.isObjectMonitorUsageSupported()) {
// VMs that support the monitor usage monitoring
ThreadInfo[] infos = threadMBean.dumpAllThreads(true, false);
for (ThreadInfo info : infos) {
if (info.getThreadId() == threadID) {
ti = info;
break;
}
}
} else {
// VM doesn't support monitor usage monitoring
ti = threadMBean.getThreadInfo(threadID, Integer.MAX_VALUE);
}
return ti;
}
而後經過vm代碼將堆棧展現在頁面上code
getStackTrace.vmhtm
<!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> <meta name="description" content="" /> <meta name="Keywords" content="" /> <title>job logs</title> </head> <body> <div> #foreach($element in $data) $element<br/> #end </div> </body> </html>
public class BaseController {
private static final VelocityEngine ve = new VelocityEngine();
private static final Logger logger = LoggerFactory.getLogger(QuartzController.class);
static{
// 初始化Velocity引擎
InputStream is = BaseController.class.getResourceAsStream("/velocity.properties");
Properties properties = new Properties();
try {
properties.load(is);
} catch (IOException e) {
e.printStackTrace();
}
ve.init(properties);
}
public String generateHtml(String vmTemplate,Object obj){
StringWriter sw = new StringWriter();
try {
VelocityContext ctx = new VelocityContext();
ctx.put("data", obj);
ve.getTemplate(vmTemplate,"UTF-8").merge(ctx, sw);
} catch (Exception e) {
logger.error("轉化vm模板出錯",e);
}finally{
if(sw!=null){
try {
sw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return sw.toString();
}
}