應用程序運行幾個小時后出現黑屏
[英]Application hits blank screen after running for couple hours
問題描述
我們最近將我們的服務器從 Tomcat 6 升級到 Tomcat 9 並且一直遇到應用程序每隔幾個小時就會停機的問題。 到目前為止我收集到的一些要點：
- 系統在本地機器上沒有任何錯誤地加載，這只發生在生產站點上。
- 該應用程序運行 6-7 小時，然后遇到此白屏問題。
- 重新啟動 Tomcat 服務器后，系統會再次恢復幾個小時，然后重復整個過程。
- 它通常會在幾個小時后出現連接問題，並且當發生這種情況時，數據庫中的客戶端連接似乎非常高。
這是 Tomcat 中記錄的內容。在調試時，用戶不是 null，所以我不確定真正的問題是什么。 我不確定我是否需要重做數據庫的連接，或者這是 Tomcat 的配置問題。
26-Jan-2022 11:23:46.614 SEVERE [https-jsse-nio-443-exec-6] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [jsp] in context with path [] threw exception [An exception occurred processing [jsp/index.jsp] at line [86]
83: <%
84: AccountInfo accountInfo = new AccountInfo();
85: String user = testOBJECTS.getName();
86: accountInfo.init(user);
87:
Stacktrace:] with root cause
java.lang.IllegalStateException: Failed to get connection..
at test.library.TestConnectionFactory.getConnection(Unknown Source)
at test.model.AccountInfo.init(Unknown Source)
at org.apache.jsp.jsp.index_jsp._jspService(index_jsp.java:248)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1726)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
這是獲取用戶的 index.jsp 頁面中的代碼。
<jsp:useBean id="testOBJECTS" class="test.mainJspBean"/>
<jsp:useBean id="testTop" class="test.loggedInBean"/>
<jsp:useBean id="aircraftFolder" class="test.library.AircraftFolder"/>
<%
testOBJECTS.setLogin(request);
if (testOBJECTS.getLoggedIn()) {
testTop.setServletTop(request, testOBJECTS.getLoggedIn(), null, testOBJECTS.getName());
AccountInfo accountInfo = new AccountInfo();
String user = testOBJECTS.getName();
accountInfo.init(user);
}
%>
這是設置用戶的 MainJspBean.java class。
package test;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
import test.library.SubscribeConnectionFactory;
import test.loginLibraries.Login;
public class mainJspBean
{
static Logger log = LogManager.getLogger(mainJspBean.class.getName());
private String clientPage = "";
private boolean loggedIn = false;
private String name = "";
public String getLogin()
{
return clientPage;
}
public void setLogin(HttpServletRequest request) throws SQLException {
String user = (String) request.getSession().getAttribute(Login.UID);
String pass = (String) request.getSession().getAttribute(Login.PASS);
boolean loggedin = loggedInBean.isLoggedIn(user, pass);
if (loggedin) {
this.loggedIn = loggedin;
name = user;
System.out.println("name: " + name);
clientPage += "<div align=\"justify\" class=\"style1\"><a href=\"https://" + IPs.WebAddress() + "/jsp/index.jsp\">TEST Online</a></div>\n";
} else {
clientPage += "<br><FORM autocomplete=\"off\" METHOD=\"post\" ACTION=\"https://"+ IPs.WebAddress() +"/test/login\" onSubmit=\"return checkWhiteSpace()\">\n" +
"<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" align=\"right\" valign=\"top\">\n" +
"<tr>\n" +
"<td nowrap align=\"right\" ><span class=\"topText\" align=\"right\">User Name: </span><input type=\"text\" name=\"uid\" id=\"uid\" size=\"8\" ></td>\n" +
"</tr>\n" +
"<tr>\n" +
"<td nowrap align=\"right\" ><span class=\"topText\" align=\"right\">Password: </span><input type=\"password\" name=\"auth\" size=\"8\"></td>\n" +
"</tr>\n" +
"<tr>\n" +
"<td nowrap colspan=\"2\" align=\"right\" ><input type=\"checkbox\" name=\"remember\" value=\"1\" checked> <span " + "class=\"topText\">Remember me.</span></td>\n" +
"</tr>\n" +
"<tr>\n" +
"<td align=\"right\" colspan=\"2\"><input type=\"submit\" class=\"IP\" name=\"login\" value=\"Login\">\n" +
"<a href=\"https://" + IPs.WebAddress() + "/payAsYouGoSignUp.jsp\">Register</a></td>\n" +
"</tr>\n" +
"</table>\n" +
"<script type=\"text/javascript\">\n" +
"<!--\n" +
"function checkWhiteSpace() {\n" +
" var s = document.getElementById(\"uid\").value;\n"+
" // Check for white space\n" +
" if (s.indexOf(\" \") > -1) {\n" +
" jAlert(\"The User Name that you entered contains a white space.\");\n" +
" return false;\n" +
" }\n" +
" return true;\n" +
"}\n" +
"//-->\n" +
"</script>\n" +
"</form>\n";
}
}
public String getWebAddress()
{
return IPs.WebAddress();
}
public boolean getLoggedIn()
{
return loggedIn;
}
public String getName()
{
return name;
}
}
這是實際的 TestConnection 頁面。
public class TestConnectionFactory {
static final Runtime RUNTIME = Runtime.getRuntime();
static Logger log = LogManager.getLogger(TestConnectionFactory.class.getName());
DataSource ds = null;
long connectCount;
/**
* A handle to the unique Singleton instance.
*/
static private TestConnectionFactory instance = null;
/**
* The constructor could be made private
* to prevent others from instantiating this class.
* But this would also make it impossible to
* create instances of Singleton subclasses.
*/
protected TestConnectionFactory() {
log.debug("<init> freeMemory:"+RUNTIME.freeMemory());
if (ds == null) {
ds = getDataSource();
}
}
/**
* @return The unique instance of this class.
*/
static public synchronized TestConnectionFactory getInstance() {
if (instance == null) {
log.info("getInstance():creating new instance");
instance = new TestConnectionFactory();
log.debug("getInstance():reusing existing instance");
}
return instance;
}
public Connection getConnection() {
Connection connection = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
connection = ds.getConnection();
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}
我試過的是指tomcat 中的這個 Java web 應用程序會定期凍結帖子，因為問題聽起來與我的應用程序類似，但修復無效。 我嘗試過的事情：
- 更改 context.xml 文件中的 maxWaitMillis 和 maxActive。
- 增加客戶端數據庫連接總數。
- 在Java代碼中為null用戶設置陷阱。
1 個解決方案
解決方案1
0 已采納 2022-02-08 16:52:58
更新 getConnection() 方法似乎解決了我的問題。
public Connection getConnection() {
Connection connection = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try {
connection = ds.getConnection();
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}
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