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Passing arguments to an applet

Amey Rane
Greenhorn

Joined: Mar 21, 2007
Posts: 15
I am passing two string arguments to the applet SurfCore.class through a cgi script. Please check wheter this is the right way to do it. All HTML code is in the proper tag . I could not keep it this way as its not allowed on the forum due to a security issue
--------------------------------------------------------------------------
print <<ENDF6;

applet code="SurfCore.class" width=900 height=900
param name=bgImage value="IMAGES/PurdueDataNetwork1.6_core.jpg"
param name=bgImage2 value="IMAGES/Router.jpg"
param name=bgImage3 value="IMAGES/CRouter.jpg"
param name=vlan_num value="
param name=vlan_num2 value="
ENDF6
print "$arv2";
print "$arv2_b";

print <<END9;
">/applet
/body
/html
END9
---------------------------------------------------------------------------
I am getting an error which looks like this

java.lang.NullPointerException
at SurfCore.init(SurfCore.java:106)
at sun.applet.AppletPanel.run(AppletPanel.java:380)
at java.lang.Thread.run(Thread.java:595)
---------------------------------------------------------------------------
Finally this is the Java File. The error is originating at line 106 which I have commented in the code as //LINE 106: Error
It just shows that second argument is not getting passed properly...

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class SurfCore extends Applet {

Image purdue;
Image router1;
Image router2;
Font bigFont;

String foo;
String foo2;


int size; // counting the no. of vlan#
int size2; // counting the no. of vlan#
int bsize;
int bsize2;

int i = 0; // for iteration
int p = 0;
int w = 0;
int n = 0;
int s = 0;
int m = 0;
int m2= 0;
int k = 0;
int l = 0;
int j = 0;
int h = 0;
int v = 0;
int q = 0;



String[] test2=new String[4];
String[] test3=new String[4];
String[] test_des=new String[4]; // split for designated router
String[] test_des2=new String[4]; // split for designated router
String[] test_des3=new String[4]; // split for designated router
String[] test_des4=new String[4]; // split for designated router
String[] test=new String[500];
String[] V_Array=new String[500];
String[] V_cord =new String[5];


String[] Temp_2 =new String[3];
String[] Temp_3 =new String[3];


int[] test_des_cord=new int[3]; // integer forms
int[] test_des_cord2=new int[3]; // integer forms

String[] btest2=new String[4];
String[] btest3=new String[4];
String[] btest_des=new String[4]; // split for designated router
String[] btest_des2=new String[4]; // split for designated router
String[] btest_des3=new String[4]; // split for designated router
String[] btest_des4=new String[4]; // split for designated router
String[] btest=new String[500];
String[] bV_Array=new String[500];
String[] bV_cord =new String[5];


String[] bTemp_2 =new String[3];
String[] bTemp_3 =new String[3];

int match_flag=0;
int bmatch_flag=0;


int[] btest_des_cord=new int[3]; // integer forms
int[] btest_des_cord2=new int[3]; // integer forms


// The colors you will use
Color redColor;
Color greenColor;
Color blackColor;
Color orangeColor;
Color blueColor;


public void init()

{
bigFont = new Font("Arial",Font.BOLD,13);

// Standard colors can be named like this
redColor = Color.red;
blackColor = Color.black;
orangeColor = Color.orange;
blueColor = Color.blue;
greenColor = Color.green;
// The following 2 lines get the Purdue topology & router image

purdue = getImage(getCodeBase(), getParameter("bgImage"));
router1 = getImage(getCodeBase(), getParameter("bgImage2"));
router2 = getImage(getCodeBase(), getParameter("bgImage3"));


foo = getParameter("vlan_num");
foo2= getParameter("vlan_num2");

test = foo.split(";");
btest = foo2.split(";"); //LINE 106 Error

size = Integer.parseInt(test[(test.length - 4)]);
bsize = Integer.parseInt(btest[(btest.length - 4)]);

size2 = Integer.parseInt(test[(test.length - 5)]);
bsize2 = Integer.parseInt(btest[(btest.length - 5)]);

test_des = test[1].split(":");
test_des2 = test[(test.length - 3)].split(",");
test_des3 = test_des2[0].split("--");
test_des4 = test_des3[0].split("=");

btest_des = btest[1].split(":");
btest_des2 = btest[(btest.length - 3)].split(",");
btest_des3 = btest_des2[0].split("--");
btest_des4 = btest_des3[0].split("=");


Temp_2 = test[1].split(":");
Temp_3 = Temp_2[0].split("--");

bTemp_2 = btest[1].split(":");
bTemp_3 = bTemp_2[0].split("--");



//System.out.println("Value1 = " + test_des_cord[0] + " Value2 = " + test_des_cord[1]);
if (Temp_3[1].equals("lamb")) {
test_des_cord[0] = 212;
test_des_cord[1] = 30;
}else if (Temp_3[1].equals("lynn")) {
test_des_cord[0] = 430;
test_des_cord[1] = 199;
}else if (Temp_3[1].equals("tel")) {
test_des_cord[0] = 293;
test_des_cord[1] = 427;
}else if (Temp_3[1].equals("erht")) {
test_des_cord[0] = 48;
test_des_cord[1] = 210 ;
}

if (test_des4[0].equals("lamb-20-c6509-01")) {
match_flag = 1;
test_des_cord2[0] = 261;
test_des_cord2[1] = 132;
}else if (test_des4[0].equals("lynn-b168-c6509-01")) {
match_flag = 1;
test_des_cord2[0] = 383;
test_des_cord2[1] = 257;
}else if (test_des4[0].equals("tel-210-c6509-01")) {
match_flag = 1;
test_des_cord2[0] = 250;
test_des_cord2[1] = 375;
}else if (test_des4[0].equals("erht-5b-c6509-01")) {
match_flag = 1;
test_des_cord2[0] = 143;
test_des_cord2[1] = 266;
}
if (match_flag != 1) {
if (test_des4[1].equals("lamb")) {
test_des_cord2[0] = 307;
test_des_cord2[1] = 45;
} else if (test_des4[1].equals("lynn")) {
test_des_cord2[0] = 462;
test_des_cord2[1] = 184;
} else if (test_des4[1].equals("tel")) {
test_des_cord2[0] = 214;
test_des_cord2[1] = 476;
} else if (test_des4[1].equals("erht")) {
test_des_cord2[0] = 63;
test_des_cord2[1] = 181;
}
}

if (bTemp_3[1].equals("lamb")) {
btest_des_cord[0] = 212;
btest_des_cord[1] = 30;
}else if (bTemp_3[1].equals("lynn")) {
btest_des_cord[0] = 430;
btest_des_cord[1] = 199;
}else if (bTemp_3[1].equals("tel")) {
btest_des_cord[0] = 293;
btest_des_cord[1] = 427;
}else if (bTemp_3[1].equals("erht")) {
btest_des_cord[0] = 48;
btest_des_cord[1] = 210 ;
}

if (btest_des4[0].equals("lamb-20-c6509-01")) {
bmatch_flag = 1;
btest_des_cord2[0] = 261;
btest_des_cord2[1] = 132;
}else if (btest_des4[0].equals("lynn-b168-c6509-01")) {
bmatch_flag = 1;
btest_des_cord2[0] = 383;
btest_des_cord2[1] = 257;
}else if (btest_des4[0].equals("tel-210-c6509-01")) {
bmatch_flag = 1;
btest_des_cord2[0] = 250;
btest_des_cord2[1] = 375;
}else if (btest_des4[0].equals("erht-5b-c6509-01")) {
bmatch_flag = 1;
btest_des_cord2[0] = 143;
btest_des_cord2[1] = 266;
}
if (bmatch_flag != 1) {
if (btest_des4[1].equals("lamb")) {
btest_des_cord2[0] = 307;
btest_des_cord2[1] = 45;
} else if (btest_des4[1].equals("lynn")) {
btest_des_cord2[0] = 462;
btest_des_cord2[1] = 184;
} else if (btest_des4[1].equals("tel")) {
btest_des_cord2[0] = 214;
btest_des_cord2[1] = 476;
} else if (btest_des4[1].equals("erht")) {
btest_des_cord2[0] = 63;
btest_des_cord2[1] = 181;
}
}


//System.out.println("Value = " + size);
for (i = 0; i < size; i++) {
v = 0;
test2 = test[i+2+size2].split(":");
for (v = 0; v < 3; v++)
{
V_Array[m++] = test2[v];
}
}

for (i = 0; i < bsize; i++) {
v = 0;
btest2 = test[i+2+bsize2].split(":");
for (v = 0; v < 3; v++)
{
bV_Array[m2++] = btest2[v];
}
}

}
//System.out.println("M value = " + m);

// end init()

public void paint(Graphics g) {
//System.out.println(" MATH = " + test[(test.length - 1)]);
g.setFont(bigFont);
g.drawImage(purdue,0,0,this);
g.setColor(blackColor.brighter());
g.drawLine(585,5,585,145);
g.drawLine(586,6,586,146);
g.drawLine(585,5,875,5);
g.drawLine(585,6,875,6);
g.drawLine(585,145,875,145);
g.drawLine(585,146,875,146);
g.drawLine(875,5,875,145);
g.drawLine(876,6,876,146);
g.setColor(orangeColor.darker());
g.drawString("LEGEND",706,25);
g.setColor(blackColor.brighter());
g.drawImage(router1,593,38,null);
g.drawString("CURRENT FIRST-HOP ROUTER",665,70);
g.drawImage(router2,600,90,null);
g.drawString("IDEAL FIRST-HOP ROUTER",665,116);
if (test[(test.length - 1)].equals("YES_MATCH")) {
if (test_des_cord[0] != 0) {
g.drawImage(router1,test_des_cord[0],test_des_cord[1],null);
}
for (q = 1; q < m; q = q + 3) {
V_cord = V_Array[q+1].split(",");
g.drawString(V_Array[q], Integer.parseInt(V_cord[0])+55, Integer.parseInt(V_cord[1])+70);
}
} else {
if (test_des_cord[0] != 0) {
g.drawImage(router1,test_des_cord[0],test_des_cord[1],null);
}
for (q = 1; q < m; q = q + 3) {
V_cord = V_Array[q+1].split(",");
g.drawString(V_Array[q], Integer.parseInt(V_cord[0])+55, Integer.parseInt(V_cord[1])+70);
}
if (test_des_cord2[0] != 0) {
g.drawImage(router2,test_des_cord2[0],test_des_cord2[1],null);
}
}

if (btest[(btest.length - 1)].equals("YES_MATCH")) {
if (btest_des_cord[0] != 0) {
g.drawImage(router1,btest_des_cord[0],btest_des_cord[1],null);
}
for (q = 1; q < m2; q = q + 3) {
bV_cord = bV_Array[q+1].split(",");
g.drawString(bV_Array[q], Integer.parseInt(bV_cord[0])+55, Integer.parseInt(bV_cord[1])+70);
}
} else {
if (btest_des_cord[0] != 0) {
g.drawImage(router1,btest_des_cord[0],btest_des_cord[1],null);
}
for (q = 1; q < m2; q = q + 3) {
bV_cord = bV_Array[q+1].split(",");
g.drawString(bV_Array[q], Integer.parseInt(bV_cord[0])+55, Integer.parseInt(bV_cord[1])+70);
}
if (btest_des_cord2[0] != 0) {
g.drawImage(router2,btest_des_cord2[0],btest_des_cord2[1],null);
}
}
}
} // end class PurdueTopology
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 42602
    
  65
It sure looks as if neither vlan_num nor vlan_num2 could possibly be passed correctly. More interesting is what the HTML looks like that gets generated - do a "view source" in the browser, and post the full applet tag.


Ping & DNS - my free Android networking tools app
Norm Radder
Ranch Hand

Joined: Aug 10, 2005
Posts: 690
    
    1
getParameter() returns null if it can't find the parameter. Check your HTML to see that the requested name is valid.
 
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