kdegiglio
asked on
Executable JAR File but no Manifest
I have an executable JAR file that i did not create. its for a demo of a trading application.
if i try to run it i get : Failed to Load Main-Class Manifest attibute from xyz.jar
let me start by saying im not a developer but know just enough to be dangerous.
if i view the contents of the jar file with 'jar tf' i can see all the packages/classes and reference to META-INF\Manifest.mf
there is no presence of a manifest file in the directory structure of the provided CD.
is the anyway for me to figure out what the main-class value should be and 'hack' my own manifest or do i have to go back to the developer/provider?
if i try to run it i get : Failed to Load Main-Class Manifest attibute from xyz.jar
let me start by saying im not a developer but know just enough to be dangerous.
if i view the contents of the jar file with 'jar tf' i can see all the packages/classes and reference to META-INF\Manifest.mf
there is no presence of a manifest file in the directory structure of the provided CD.
is the anyway for me to figure out what the main-class value should be and 'hack' my own manifest or do i have to go back to the developer/provider?
ASKER
xp seems to think it is exeutable because the TYPE shows as "EXECUTABLE JAR FILE"
could that be misleading, or is it probably correct?
i will try the above with a few different classnames.
is there any way to interrogate the jar for the presence of a main?
could that be misleading, or is it probably correct?
i will try the above with a few different classnames.
is there any way to interrogate the jar for the presence of a main?
grab jstart at http://www.objects.com.au/products/jstart
Use it to open your jar and it will tell you what main's are available.
> could that be misleading, or is it probably correct?
yes, thats just cause its a .jar
Use it to open your jar and it will tell you what main's are available.
> could that be misleading, or is it probably correct?
yes, thats just cause its a .jar
>>could that be misleading
Yes. It always says that
Yes. It always says that
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kdegiglio, can you tell us how you used that comment as the answer?
did jstart help u find any main()'s?
ASKER
the first link in the accepted answer allowed me to find the main class by greping
did u try jstart? am just looking for some feedback.
try
java -classpath xyz.jar LikelyLookingClassName