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我們爲Sybase服務器開發了基於Web的監控應用程序，並且在生產環境中使用jfree生成圖形時出現問題。Java Servlet拋出異常
我們通常在QA機器上構建並測試我們的應用程序，然後將生成的* .war文件ftp到生產環境。
當生產環境中出現完全相同的代碼無法在生產中生成圖形時，問題就出現了。
下面是類和包我們導入：
package var;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
import java.text.Format;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.HashSet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.CategoryLabelPositions;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.axis.DateAxis;
import org.jfree.data.time.Minute;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import java.sql.DriverManager;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.sql.*;
import javax.naming.*;
import org.jfree.ui.RectangleInsets;
import java.awt.GraphicsEnvironment;
下面的代碼段我們認爲是引發錯誤：
else
{
int interval=Integer.parseInt(request.getParameter("interval").toString());
System.out.println("I Before OS Level Object creation");
OSLevel osl=new OSLevel();
width=1500;
height=500;
XYDataset mdaDataSet=null;
try
{
System.out.println("I Before XY Dataset generation");
mdaDataSet=osl.generateXYDataSet(start, end, dval3, cpuval3, dsql3,interval);
CategoryPlot plotmda = null;
System.out.println("I Before Time Series generation");
chartos = ChartFactory.createTimeSeriesChart(
title, // chart title
"Time", // domain axis label
"CPU Usage Percentage", // range axis label
mdaDataSet, // data
true, // include legend
true, // tooltips
false // urls
);
System.out.println("The title is:"+title);
}
catch(Exception e)
{
System.out.println("I am in the Chart Generation TRY Block");
e.printStackTrace();
}
最後下的server.log條目QA其次是在生產中：
the query is:SELECT CPUUsed,DateTime FROM bureau.bp_mda_cpu WHERE (DateTime > '2013-07-11' and DateTime < '2013-07-18') and ClientID='G123'
I Before OS Level Object creation
I Before XY Dataset generation
I Before Time Series generation
The title is:MITSUBISHI_GLOSS Sybase CPU(MDA CPU report)
The File Path is:/tmp/tmpChart148725123563269780.tmp
END of the report
the query is:SELECT CPUUsed,DateTime FROM bureau.bp_mda_cpu WHERE (DateTime > '2013-07-11' and DateTime < '2013-07-18') and ClientID='G123'
I Before OS Level Object creation
I Before XY Dataset generation
I Before Time Series generation
Jul 18, 2013 9:52:07 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet GenerateDBReport threw exception
javax.servlet.ServletException: Servlet execution threw an exception
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:311)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:263)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:562)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1018)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:196)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:499)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:562)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1018)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2748)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:186)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:562)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1018)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:151)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:512)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:562)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1018)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:199)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:637)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:463)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:568)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:631)
at java.lang.Thread.run(Thread.java:662)
更改代碼行後，我有點foll由於新的錯誤：
java.lang.NoClassDefFoundError: Could not initialize class org.jfree.chart.JFreeChart
at org.jfree.chart.ChartFactory.createLineChart(ChartFactory.java:1242)
at var.DatabaseLevelReport.doGet(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
這看起來像一個已知的問題，但我仍然沒能解決它：
看着你已經上傳的堆棧跟蹤，這個錯誤看起來並不像它與任何外部庫有關。您是否在QA和生產環境中使用相同的容器服務器/版本？另請檢查以確保您的網絡應用程序中沒有應用程序服務器特定的罐子，例如 「servlet-api.jar」。我相信建議不要在網絡應用程序中手動添加這些罐子。 – PJR