how to create jar file?

Question

I am trying to create a jar file for the .java program

followed the steps as

Step 1. Create a 'mywork' folder Step 2: Put the XYZ.java and the gson.jar file under the mywork folder Step 3. Use javac -cp .:gson.jar XYZ.class Step 4. Create Jar File -> jar cf XYZ.jar XYZ.class Step 5. Create a Manifest.txt and modify it to include MainClass:XYZ Step 6. Modify Manifest.txt to include classpath for gson.jar Step 7. Then run the command-> jar cfm XYZ.jar Manifest.txt XYZ.class argument1 argument2

when I am doing step 7 I am getting

"java.io.IOException: invalid header field" error

Where am I going wrong, please help me to solve the problem.

My Manifest.txt is like

Manifest-Version: 1.0 Class-Path:gson.jar Created-By: 1.7.0_06 (Oracle Corporation) Main-Class: XYZ

main method:

public static void main(String[] args) throws Exception { // Enter the values for the arguments String dirstr = args[0]; String logfiledirstr = args[1]; XYZ data = new XYZ(); data.method1(dirstr,logfiledirstr); }

@Mureinik inputs are CSV files. Also Edited to include the main class. — user3188390
– user3188390, Commented Apr 6, 2014 at 16:53
a stacktrace might help in the disgnostic (or at least XYZ code) — user180100
– user180100, Commented Apr 6, 2014 at 16:55
only a shot in the dark but maybe 'Class-Path:gson.jar' is missing a space between the : and the gson.jar — William Reed
– William Reed, Commented Apr 6, 2014 at 17:15

Hurda · Accepted Answer · 2014-04-06 18:43:02Z

You need to prefix value with space after the semicolon

change

Class-Path:gson.jar

to

Class-Path: gson.jar

viz http://docs.oracle.com/javase/7/docs/technotes/guides/jar/jar.html#Name-Value_pairs_and_Sections

value:SPACE *otherchar newline *continuation

SubodhD · Accepted Answer · 2014-04-07 07:10:30Z

1

There has to be a "New Line" at the end of your manifest file. Give a New line and then check.

Your file must be like this:

Manifest-Version: 1.0 Class-Path: gson.jar Created-By: 1.7.0_06 (Oracle Corporation) Main-Class: XYZ (Press Enter)

edited Apr 7, 2014 at 7:10

answered Apr 6, 2014 at 16:57

SubodhD

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5 Comments

user3188390 Over a year ago

Thanks for the suggestion, but I am not sure what does that mean?

djechlin Over a year ago

@user3188390 it means open your manifest file, hit enter (to create a new line), then save it.

user3188390 Over a year ago

@Subodh : No it did not work. Thanks for the suggestion.

SubodhD Over a year ago

I am just guessing now. Give a space between "Class-Path:" and "gson.jar" and try.

SubodhD Over a year ago

That's the format used by the Manifest file...Glad that it worked..:)

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