displaying graph in linux environment
<p>The graph present in my application is not displaying well. When I run it on linux environment.
I get the following Exception:
problem with link map</p>

<pre><code>java.lang.NullPointerException
    at javachart.chart.Highlighter.getHighlightPointSet(Unknown Source)
    at javachart.servlet.Bean.getLinkMap(Unknown Source)
    at org.apache.jsp.www.chartByHotelSNS_jsp._jspService(chartByHotelSNS_js                                                                                        p.java:1232)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper                                                                                        .java:369)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3                                                                                        22)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl                                                                                        icationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF                                                                                        ilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp                                                                                        atcher.java:638)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(Applica                                                                                        tionDispatcher.java:444)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationD                                                                                        ispatcher.java:382)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDis                                                                                        patcher.java:310)
    at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.j                                                                                        ava:696)
    at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.jav                                                                                        a:667)
    at org.apache.jsp.www.process_jsp._jspService(process_jsp.java:460)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper                                                                                        .java:369)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3                                                                                        22)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl                                                                                        icationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF                                                                                        ilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV                                                                                        alve.java:235)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV                                                                                        alve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j                                                                                        ava:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j                                                                                        ava:102)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:                                                                                        567)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal                                                                                        ve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav                                                                                        a:330)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java                                                                                        :829)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce                                                                                        ss(Http11Protocol.java:598)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:44                                                                                        7)
    at java.lang.Thread.run(Thread.java:619)
</code></pre>

<p>Can anyone let me know why this Exception is occurring and what is the solution for this.</p>
