running jar with multiple arguments from batch file

Question

The following is a snippet from a batch file where I try to run myProgram.jar

set /p _count="enter count: "
set /p _toc="enter TOC"

choice /N /C:TO /M "Select Type(T/O): "
if errorlevel ==1 set _type=T
if errorlevel ==2 set _type=O

choice /N /C:SF /M "Select status(S/F): "
if errorlevel ==1 set _status=T
if errorlevel ==2 set _status=O

java -jar dir/myProgram.jar %_count% %_type% %_status% %_toc%

The batch file executes the java -jar command with four arguments namely _count , _type , _status and _toc .

I only get the values of _count and _toc in java.

The problem is the remaining two parameters are getting passed as null values and as a result I am facing NullPointerException everytime I run the program.

Answer 1

From CHOICE/? :

When you use ERRORLEVEL parameters in a batch program, list them in decreasing order.

That means you use the following syntax:

If ErrorLevel 2 Set "_type=O"
If ErrorLevel 1 Set "_type=T"

An often used alternative, if you prefer it, is to use %ERRORLEVEL% instead:

If "%ErrorLevel%"=="1" Set "_status=T"
If "%ErrorLevel%"=="2" Set "_status=O"

Answer 2

tl;dr

Your error can't be reproduced and I'm quite sure it leads to a simple typographical error or in your Java App, which you didn't show to us.

---

I did the following to reproduce your behavior:

1. Create a simple Java App, writing args to the console:

import java.util.Arrays;

class App {
    public static void main(String[] args) {
        Arrays.stream(args).forEach(System.out::println);
    }
}

2. Compile it using jdk1.8.0_91 on Windows 10.

javac .\App.java
jar cvfe App.jar App *.class

3. Execute test.bat with your above code: (Just for the case you edit your question)

set /p _count="enter count: "
set /p _toc="enter TOC"

choice /N /C:TO /M "Select Type(T/O): "
if errorlevel ==1 set _type=T
if errorlevel ==2 set _type=O

choice /N /C:SF /M "Select status(S/F): "
if errorlevel ==1 set _status=T
if errorlevel ==2 set _status=O

java -jar App.jar %_count% %_type% %_status% %_toc%

With the inputs: 5, 6, T, F it gave the following output:

5
T
O
6

That means - IMHO - your error lays in your java code obtaining args , the NullPointerException is thrown by System.Console() and not args[n] , or your posted batch code isn't exactly how it is executed on your computer.

To sum it up: If your batch calls the command line with 4 parameters (like your example code does), args has 4 parameters.