arm - How to solve error " Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException:"? -

i made myapp arm processor(armv7, 512 ram, debian wheezy os, openjdk-7 installed). when run myapp on os gives error. code , error below. search according error can't solve error. myapp works fine on pc have installed windows 7 , ubuntu 12.04. 1 have idea or solution suggest me?

import javax.swing.jframe; import javax.swing.jpanel;  /**  *  * @author jay_2  */ public class myapp extends jpanel {      /**      * @param args command line arguments      */     public static javax.swing.jtextfield inputext;     private javax.swing.jlabel inputlbl;     private javax.swing.jscrollpane jscrollpane1;     private javax.swing.jscrollpane jscrollpane2;     private javax.swing.jlabel outputlbl;     public static javax.swing.jtextarea outputtextarea;     private javax.swing.jlabel templbl;     public static javax.swing.jlabel tempshowlbl;     public static javax.swing.jtextarea temptextarea;      public myapp() {         // todo code application logic here         setcomponents();     }      private void setcomponents() {         templbl = new javax.swing.jlabel("temperature :");         tempshowlbl = new javax.swing.jlabel("label");         inputlbl = new javax.swing.jlabel("input :");         inputext = new javax.swing.jtextfield();         outputlbl = new javax.swing.jlabel("output :");         jscrollpane1 = new javax.swing.jscrollpane();         outputtextarea = new javax.swing.jtextarea();         jscrollpane2 = new javax.swing.jscrollpane();         temptextarea = new javax.swing.jtextarea(55000, 10);          this.setbackground(new java.awt.color(204, 255, 255));          templbl.setfont(new java.awt.font("tahoma", 1, 18)); // noi18n          tempshowlbl.setfont(new java.awt.font("tahoma", 1, 14)); // noi18n                  inputlbl.setfont(new java.awt.font("tahoma", 1, 14)); // noi18n          inputext.setfont(new java.awt.font("tahoma", 0, 14)); // noi18n         inputext.settext(""); // noi18n          outputlbl.setfont(new java.awt.font("tahoma", 1, 14)); // noi18n          outputtextarea.setcolumns(20);         outputtextarea.setrows(5);         jscrollpane1.setviewportview(outputtextarea);          temptextarea.setcolumns(20);         temptextarea.setrows(10);         jscrollpane2.setviewportview(temptextarea);          javax.swing.grouplayout jpanel1layout = new javax.swing.grouplayout(this);         this.setlayout(jpanel1layout);         jpanel1layout.sethorizontalgroup(                 jpanel1layout.createparallelgroup(javax.swing.grouplayout.alignment.leading).addgroup(jpanel1layout.createsequentialgroup().addcontainergap().addgroup(jpanel1layout.createparallelgroup(javax.swing.grouplayout.alignment.leading).addgroup(jpanel1layout.createsequentialgroup().addcomponent(inputlbl).addcontainergap(482, short.max_value)).addgroup(javax.swing.grouplayout.alignment.trailing, jpanel1layout.createsequentialgroup().addgroup(jpanel1layout.createparallelgroup(javax.swing.grouplayout.alignment.trailing).addgroup(javax.swing.grouplayout.alignment.leading, jpanel1layout.createsequentialgroup().addgroup(jpanel1layout.createparallelgroup(javax.swing.grouplayout.alignment.leading).addcomponent(outputlbl).addcomponent(jscrollpane1, javax.swing.grouplayout.preferred_size, 253, javax.swing.grouplayout.preferred_size)).addpreferredgap(javax.swing.layoutstyle.componentplacement.related, 102, short.max_value).addcomponent(jscrollpane2, javax.swing.grouplayout.preferred_size, 140, javax.swing.grouplayout.preferred_size)).addgroup(jpanel1layout.createsequentialgroup().addcomponent(inputext, javax.swing.grouplayout.preferred_size, 156, javax.swing.grouplayout.preferred_size).addpreferredgap(javax.swing.layoutstyle.componentplacement.related, 122, short.max_value).addcomponent(templbl).addpreferredgap(javax.swing.layoutstyle.componentplacement.unrelated).addcomponent(tempshowlbl, javax.swing.grouplayout.preferred_size, 77, javax.swing.grouplayout.preferred_size))).addgap(36, 36, 36)))));         jpanel1layout.setverticalgroup(                 jpanel1layout.createparallelgroup(javax.swing.grouplayout.alignment.leading).addgroup(jpanel1layout.createsequentialgroup().addcontainergap().addcomponent(inputlbl).addpreferredgap(javax.swing.layoutstyle.componentplacement.related).addgroup(jpanel1layout.createparallelgroup(javax.swing.grouplayout.alignment.baseline).addcomponent(inputext, javax.swing.grouplayout.preferred_size, 30, javax.swing.grouplayout.preferred_size).addcomponent(templbl, javax.swing.grouplayout.preferred_size, 23, javax.swing.grouplayout.preferred_size).addcomponent(tempshowlbl, javax.swing.grouplayout.preferred_size, 19, javax.swing.grouplayout.preferred_size)).addgroup(jpanel1layout.createparallelgroup(javax.swing.grouplayout.alignment.leading).addgroup(jpanel1layout.createsequentialgroup().addgap(43, 43, 43).addcomponent(outputlbl).addpreferredgap(javax.swing.layoutstyle.componentplacement.unrelated).addcomponent(jscrollpane1, javax.swing.grouplayout.default_size, 154, short.max_value)).addgroup(jpanel1layout.createsequentialgroup().addgap(3, 3, 3).addcomponent(jscrollpane2, javax.swing.grouplayout.default_size, 222, short.max_value))).addcontainergap()));      }      public static void main(string[] args) {         // todo code application logic here         jframe jframe = new jframe();         jframe.add(new myapp());         jframe.setsize(500, 400);         jframe.setdefaultcloseoperation(jframe.exit_on_close);         jframe.setvisible(true);     } } 

error :

exception in thread "awt-eventqueue-0" java.lang.nullpointerexception:      @ java.util.concurrent.locks.abstractqueuedsynchronizer.compareandsetstate(abstractqueuedsynchronizer.java:566)     @ java.util.concurrent.locks.reentrantlock$nonfairsync.lock(reentrantlock.java:211)     @ java.util.concurrent.locks.reentrantlock.lock(reentrantlock.java:290)     @ sun.awt.suntoolkit.flushpendingevents(suntoolkit.java:551)     @ java.awt.eventqueue.postevent(eventqueue.java:240)     @ sun.awt.posteventqueue.flush(suntoolkit.java:2024)     @ sun.awt.suntoolkit.flushpendingevents(suntoolkit.java:560)     @ java.awt.eventqueue.getnextevent(eventqueue.java:523)     @ java.awt.eventdispatchthread.pumponeeventforfilters(eventdispatchthread.java:180)     @ java.awt.eventdispatchthread.pumpeventsforfilter(eventdispatchthread.java:128)     @ java.awt.eventdispatchthread.pumpeventsforhierarchy(eventdispatchthread.java:117)     @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:113)     @ java.awt.eventdispatchthread.pumpevents(eventdispatchthread.java:105)     @ java.awt.eventdispatchthread.run(eventdispatchthread.java:90) exception in thread "awt-xawt" java.lang.nullpointerexception:      @ java.util.concurrent.locks.abstractqueuedsynchronizer.compareandsetstate(abstractqueuedsynchronizer.java:566)     @ java.util.concurrent.locks.reentrantlock$nonfairsync.lock(reentrantlock.java:211)     @ java.util.concurrent.locks.reentrantlock.lock(reentrantlock.java:290)     @ sun.awt.suntoolkit.awtlock(suntoolkit.java:237)     @ sun.awt.x11.xbasewindow.ungrabinput(xbasewindow.java:883)     @ sun.awt.x11.xtoolkit.run(xtoolkit.java:675)     @ sun.awt.x11.xtoolkit.run(xtoolkit.java:591)     @ java.lang.thread.run(thread.java:722) 

removed openjdk-7 version , install oracle jdk arm processor , hard float os image. here link that.oracle jdk arm processor