Could not initialize class sun.awt.X11GraphicsEnvironment on linux

I am facing problem when i use  JOption in  JOptionPane.showConfirmDialog on linux
same code is running fine in windows.

java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment
      java.lang.Class.forName0(Native Method)
      java.lang.Class.forName(Class.java:169)
      java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)
      sun.awt.X11.XToolkit.<clinit>(XToolkit.java:89)
      java.lang.Class.forName0(Native Method)
      java.lang.Class.forName(Class.java:169)
      java.awt.Toolkit$2.run(Toolkit.java:834)
      java.security.AccessController.doPrivileged(Native Method)
      java.awt.Toolkit.getDefaultToolkit(Toolkit.java:826)
      sun.swing.SwingUtilities2$AATextInfo.getAATextInfo(SwingUtilities2.java:126)
      javax.swing.plaf.metal.MetalLookAndFeel.initComponentDefaults(MetalLookAndFeel.java:1556)
      javax.swing.plaf.basic.BasicLookAndFeel.getDefaults(BasicLookAndFeel.java:130)
      javax.swing.plaf.metal.MetalLookAndFeel.getDefaults(MetalLookAndFeel.java:1591)
      javax.swing.UIManager.setLookAndFeel(UIManager.java:541)
      javax.swing.UIManager.setLookAndFeel(UIManager.java:581)
      javax.swing.UIManager.initializeDefaultLAF(UIManager.java:1343)
      javax.swing.UIManager.initialize(UIManager.java:1432)
      javax.swing.UIManager.maybeInitialize(UIManager.java:1420)
      javax.swing.UIManager.getDefaults(UIManager.java:660)
      javax.swing.UIManager.getString(UIManager.java:789)
      javax.swing.JOptionPane.showConfirmDialog(JOptionPane.java:673)
      org.apache.jsp.jsp.ConChange_005fAllocation_jsp._jspService(ConChange_005fAllocation_jsp.java:150)
      org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

if(action_id==1)// for Update_Change_Allocation
{
 
	map.put("porposed_id",porposed_id);
	map.put("company",company);
	map.put("meet_date",meet_date);
	map.put("priority",priority);
	map.put("emp_id",emp_id);
	map.put("create_by",create_by);
	map.put("designation_id",designation_id);
 
	if(!company.equals("0") )
	 { 
		int check = 1;
		System.out.println("check taru ranjan"+check);
        int result1 = meet.execute(5,map,con);
		System.out.println("result1 taru ranjan"+result1);
        int result2 = meet.execute(6,map,con);
		//System.out.println("result2 taru ranjan"+result2);
		if(result1 > 0 )
		{
	      check =JOptionPane.showConfirmDialog(null, "Schedule date is already assigned to employee for other company. Do you want to continue ?");
		  System.out.println("check"+check);
			if( check == 1 || check == 2 )
			{
			  result=3;
			}
			else
			{
			result = meet.execute(1,map,con);
			}
	    }
		else
		{
		  result = meet.execute(1,map,con);
		}
     }
 
 
	//System.out.println("result="+result);
}

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