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java SimpleDateFormat with gcj (gnu compiler for java)

Posted on 2010-09-13
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Last Modified: 2013-11-23
Hi there,
I would like to use gcj (gnu compiler for java) to protect my java code.
I got problem with java's SimpleDateFormat, however.  gcj showed error like
the bottom.  The closest info I found from web is in
http://old.nabble.com/SimpleDateFormat-td18000139.html

Any advice is very much appreciated.

Reggie

C:\Program Files\Z33>z33_exe
Exception in thread "main" java.lang.ExceptionInInitializerError
   at java.lang.Class.initializeClass(Unknown Source)
   at java.util.Currency.getInstance(Unknown Source)
   at java.text.DecimalFormatSymbols.<init>(Unknown Source)
   at java.text.DecimalFormatSymbols.getInstance(Unknown Source)
   at java.text.NumberFormat.computeInstance(Unknown Source)
   at java.text.NumberFormat.getNumberInstance(Unknown Source)
   at java.text.SimpleDateFormat.<init>(Unknown Source)
   at java.text.SimpleDateFormat.<init>(Unknown Source)
   at z33_exe.getCurrentDate(Unknown Source)
   at z33_exe.read_txt(Unknown Source)
   at z33_exe.readLicenseFiles(Unknown Source)
   at z33_exe.main(Unknown Source)
Caused by: java.lang.NullPointerException
   at java.io.InputStreamReader.read(Unknown Source)
   at java.io.BufferedReader.fill(Unknown Source)
   at java.io.BufferedReader.readLine(Unknown Source)
   at java.util.Properties.load(Unknown Source)
   at java.util.Currency.<clinit>(Unknown Source)
   at java.lang.Class.initializeClass(Unknown Source)
   ...11 more


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Comment
Question by:asugri
  • 5
  • 5
10 Comments
 
LVL 40

Assisted Solution

by:Gurvinder Pal Singh
Gurvinder Pal Singh earned 2000 total points
ID: 33664047
could you please post the source as well, as it clearly seems (from Caused by: java.lang.NullPointerException) that you have operated on an initialized variable.
0
 

Author Comment

by:asugri
ID: 33664175
Here is important portion of the ode.  (I use cygwin's gcj.  and gcc/gcj version
is 4.3.4.

import java.net.*;
import java.io.*;
import java.util.*;
import java.text.*;
import java.lang.*;
public class z33 {
   public static void main(String[] args) throws IOException {
           .....
            String currentDate = getCurrentDate();
           .......
    }
    private static String getCurrentDate() {
        Date present_time = new Date();
        SimpleDateFormat showTime = new SimpleDateFormat("MMddyyyy");
        return showTime.format(present_time);
    } //function getCurrentDate
}
0
 
LVL 40

Assisted Solution

by:Gurvinder Pal Singh
Gurvinder Pal Singh earned 2000 total points
ID: 33664259
Are you loading any properties file in this class, since i see the following exception stack trace?
<<Caused by: java.lang.NullPointerException
   at java.io.InputStreamReader.read(Unknown Source)
   at java.io.BufferedReader.fill(Unknown Source)
   at java.io.BufferedReader.readLine(Unknown Source)
   at java.util.Properties.load(Unknown Source)>>
0
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Author Comment

by:asugri
ID: 33664456
Yes, I did have some places with BufferedReader.readLine.  However, it might not be related because
1. When I hardcoded getCurrentDate to return a date like 09132010, gcj worked OK.
2. When I tried to avoid SimpleDateFormat by using other function (see TestDate.java),
   I still get similar error, but I did not have BufferedReader.readLine in the code.

PC@PC_Laptop /cygdrive/c/test_gcj
$ cat TestDate.java
import java.util.*;
import java.text.*;

public class TestDate  {
   /*
   public static final int FULL;
   public static final int LONG;
   public static final int MEDIUM;
   public static final int SHORT;
   */
   public static void main (String args[]) {
      System.out.println("Test for Date");
      Date date1 = new Date();
      String DateString = date1.toString();
      System.out.println("Date:"+ DateString);

      Date today = new Date();
      DateFormat fmt;
      fmt = DateFormat.getDateTimeInstance(1, 1, Locale.US);
      String formatted = fmt.format(today);
      System.out.println("today:"+ formatted);
      System.out.println();

      fmt = DateFormat.getDateTimeInstance(1, 1, Locale.UK);
      formatted = fmt.format(today);
      System.out.println("today:"+ formatted);
      System.out.println();

      fmt = DateFormat.getDateTimeInstance(0, 1, Locale.UK);
      formatted = fmt.format(today);
      System.out.println("today:"+ formatted);
      System.out.println();

      fmt = DateFormat.getDateTimeInstance(2, 1, Locale.UK);
      formatted = fmt.format(today);
      System.out.println("today:"+ formatted);
      System.out.println();

      fmt = DateFormat.getDateTimeInstance(3, 1, Locale.UK);
      formatted = fmt.format(today);
      System.out.println("today:"+ formatted);
      System.out.println();
   }
}

PC@PC_Laptop /cygdrive/c/test_gcj
$ !296
javac TestDate.java

PC@PC_Laptop /cygdrive/c/test_gcj
$ !298
gcj --main=TestDate -o TestDate.exe TestDate.class

PC@PC_Laptop /cygdrive/c/test_gcj
$ ls -l *.exe
-rwxr-xr-x+ 1 PC None 37359 2010-09-13 10:07 TestDate.exe
-rwxr-xr-x+ 1 PC None 30625 2010-09-10 15:35 snippetCalendar.exe

PC@PC_Laptop /cygdrive/c/test_gcj
$ !301
./TestDate
Test for Date
Date:Mon Sep 13 10:08:14 GMT-07:00 2010
Exception in thread "main" java.lang.ExceptionInInitializerError
   at java.lang.Class.initializeClass(Unknown Source)
   at java.util.Currency.getInstance(Unknown Source)
   at java.text.DecimalFormatSymbols.<init>(Unknown Source)
   at java.text.DecimalFormatSymbols.getInstance(Unknown Source)
   at java.text.NumberFormat.computeInstance(Unknown Source)
   at java.text.NumberFormat.getNumberInstance(Unknown Source)
   at java.text.SimpleDateFormat.<init>(Unknown Source)
   at java.text.DateFormat.computeInstance(Unknown Source)
   at java.text.DateFormat.getDateTimeInstance(Unknown Source)
   at TestDate.main(Unknown Source)
Caused by: java.lang.NullPointerException
   at java.io.InputStreamReader.read(Unknown Source)
   at java.io.BufferedReader.fill(Unknown Source)
   at java.io.BufferedReader.readLine(Unknown Source)
   at java.util.Properties.load(Unknown Source)
   at java.util.Currency.<clinit>(Unknown Source)
   at java.lang.Class.initializeClass(Unknown Source)
   ...9 more

PC@PC_Laptop /cygdrive/c/test_gcj
0
 
LVL 40

Accepted Solution

by:
Gurvinder Pal Singh earned 2000 total points
ID: 33665253
can you once replace Locale.US with Locales.getCurrent(); and try?
0
 

Author Comment

by:asugri
ID: 33665509
The code did not compile with Locale.getCurrent() and Locales.getCurrent().
Please see error message below.

Thx.


PC@PC_Laptop /cygdrive/c/test_gcj
$ !jav
javac TestDate2.java
TestDate2.java:22: cannot resolve symbol
symbol  : variable Locales
location: class TestDate2
      fmt = DateFormat.getDateTimeInstance(1, 1, Locales.getCurrent());
                                                 ^
1 error

PC@PC_Laptop /cygdrive/c/test_gcj
$ !vi
vi TestDate2.java

PC@PC_Laptop /cygdrive/c/test_gcj
$ !ja
javac TestDate2.java
TestDate2.java:22: cannot resolve symbol
symbol  : method getCurrent ()
location: class java.util.Locale
      fmt = DateFormat.getDateTimeInstance(1, 1, Locale.getCurrent());
                                                       ^
1 error
0
 
LVL 40

Expert Comment

by:Gurvinder Pal Singh
ID: 33665599
Ohh, sorry, i meant
Locale.getDefault()
0
 

Author Comment

by:asugri
ID: 33666057
Similar (if not identical) error with SimpleDateFormat appearing.
Notiece that I did not use SimpleDateFormat in java code.

Thx.

Reggie


PC@PC_Laptop /cygdrive/c/test_gcj
$ !jav
javac TestDate2.java

PC@PC_Laptop /cygdrive/c/test_gcj

PC@PC_Laptop /cygdrive/c/test_gcj
$ gcj --main=TestDate2 -o TestDate2.exe TestDate2.class

PC@PC_Laptop /cygdrive/c/test_gcj
$ ./TestDate2
Test for Date
Date:Mon Sep 13 12:43:08 GMT-07:00 2010
Exception in thread "main" java.lang.ExceptionInInitializerError
   at java.lang.Class.initializeClass(Unknown Source)
   at java.util.Currency.getInstance(Unknown Source)
   at java.text.DecimalFormatSymbols.<init>(Unknown Source)
   at java.text.DecimalFormatSymbols.getInstance(Unknown Source)
   at java.text.NumberFormat.computeInstance(Unknown Source)
   at java.text.NumberFormat.getNumberInstance(Unknown Source)
   at java.text.SimpleDateFormat.<init>(Unknown Source)
   at java.text.DateFormat.computeInstance(Unknown Source)
   at java.text.DateFormat.getDateTimeInstance(Unknown Source)
   at TestDate2.main(Unknown Source)
Caused by: java.lang.NullPointerException
   at java.io.InputStreamReader.read(Unknown Source)
   at java.io.BufferedReader.fill(Unknown Source)
   at java.io.BufferedReader.readLine(Unknown Source)
   at java.util.Properties.load(Unknown Source)
   at java.util.Currency.<clinit>(Unknown Source)
   at java.lang.Class.initializeClass(Unknown Source)
   ...9 more

PC@PC_Laptop /cygdrive/c/test_gcj
$ cat TestDate2.java
import java.util.*;
import java.text.*;
public class TestDate2  {
   public static void main (String args[]) {
      System.out.println("Test for Date");
      Date date1 = new Date();
      String DateString = date1.toString();
      System.out.println("Date:"+ DateString);

      Date today = new Date();
      DateFormat fmt;
      fmt = DateFormat.getDateTimeInstance(1, 1, Locale.getDefault());
0
 
LVL 40

Assisted Solution

by:Gurvinder Pal Singh
Gurvinder Pal Singh earned 2000 total points
ID: 33666105
can you simply print Locale.getDefault()?

System.out.println(Locale.getDefault());

what is the output?
0
 

Author Comment

by:asugri
ID: 33666384
$ ./TestDate2
Test for Date
Date:Mon Sep 13 13:11:59 GMT-07:00 2010
Locale.getDefault() value = C._US
Exception in thread "main" java.lang.ExceptionInInitializerError
   at java.lang.Class.initializeClass(Unknown Source)
   at java.util.Currency.getInstance(Unknown Source)
   at java.text.DecimalFormatSymbols.<init>(Unknown Source)
   at java.text.DecimalFormatSymbols.getInstance(Unknown Source)
   at java.text.NumberFormat.computeInstance(Unknown Source)
   at java.text.NumberFormat.getNumberInstance(Unknown Source)
   at java.text.SimpleDateFormat.<init>(Unknown Source)
   at java.text.DateFormat.computeInstance(Unknown Source)
   at java.text.DateFormat.getDateTimeInstance(Unknown Source)
   at TestDate2.main(Unknown Source)
Caused by: java.lang.NullPointerException
   at java.io.InputStreamReader.read(Unknown Source)
   at java.io.BufferedReader.fill(Unknown Source)
   at java.io.BufferedReader.readLine(Unknown Source)
   at java.util.Properties.load(Unknown Source)
   at java.util.Currency.<clinit>(Unknown Source)
   at java.lang.Class.initializeClass(Unknown Source)
   ...9 more
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