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Java Forum / General / October 2007Accessing the name of the CLASS/JAR file invoked
Hello, I am trying to pack all my files into a JAR - this includes CLASS files and other textual files such as help, std configs, etc. I would like to be able to extract them from the Java app straight out of the JAR - and for this I need to know what the name of the JAR file invoked was (it might have been renamed for X reasons) Is there any sure way to do this? (the alternative is to have an external file to contain said data, but I want to know if a way to have everything self-contained exists, first) Thanks, Andrew .. > I am trying to pack all my files into a JAR - this includes CLASS > files and other textual files such as help, std configs, etc. Good idea. > I would like to be able to extract them .. Do you mean, 'access the resource from within the jar', or 'extract each resource to the local file-system'? For the former, see Class.getResource("path/name"). Andrew T. > > I would like to be able to extract them .. > [quoted text clipped - 3 lines] > > For the former, see Class.getResource("path/name"). Thanks for that - looks like it does what I was looking for, will test. However I am trying to do both actually - makes kind of like a self- extracting archive etc etc. Cheers, Andrew K .. >..kind of like a self-extracting archive .. My advice on that is "don't". For good deployment options, see Java web start. Here are some examples. <http://www.physci.org/jws/> Whether these applications are extracted to class files, or kept locked up in the original jars (at the decision of the end user, or their sys-admin.) I neither know nor care. I use Class.getResource() and it provides an URL pointing to the resource in question, whether it is still on the host site (lazy downloads) or cached on the file-system (jar'd or loose). Best of all, if I upload a new Jar (or Jar's - it is easy to break up JWS apps. into small easy 'chunks') the end-user gets the new jars on next application start-up. Why p*ss about with self-extracting archives when you can have all that, and more*? * See the examples, for some other neat desktop integration and 'trimmings' provided with JWS launch.  SignatureAndrew Thompson http://www.athompson.info/andrew/ > . >> ..kind of like a self-extracting archive .. > > My advice on that is "don't". For good deployment > options, see Java web start. Here are some examples. > <http://www.physci.org/jws/> ... No matter how good an option Java web start is for programs that can use it, it is not a universal solution. See my case of a batch program that needs to run with no user interaction and no GUI. I am VERY interested in alternatives that allow distribution of a single JAR, even if they do involve a bit more coding. Patricia >> . >>> ..kind of like a self-extracting archive .. [quoted text clipped - 6 lines] >No matter how good an option Java web start is ..for programs that can use >it, it is not a universal solution. Considering the %age of desk-top. apps that *can* be deployed using web start, I'd prefer to deal with other cases as they 'arise'. Or to put that more specifically, when the OP replies (usually in irritation) that they 'have already considered web start'* and it is no good because.. (insert reasons here). * Often, from some earlier discussion I'd had with them, but entirely forgotten. >..See my case of a batch program that >needs to run with no user interaction and no GUI. Yes, that was a good example, but that was *your* use-case. I would like to hear it from the OP, what *their* use-case is. SignatureAndrew Thompson http://www.athompson.info/andrew/ > Considering the %age of desk-top. apps that *can* > be deployed using web start, I'd prefer to deal with > other cases as they 'arise'. Well actually most of the time I'm dealing with server test apps. They may or may not need GUIs, but they generally would run in the background without. Not a requirement, but it would be good to know that it can be done. Patricia, what was your case/where is it located if I may peek? This is mostly a learning experience project, so any input is good - so if you do know of a way to find out what the name of the invoked file is, twould be much appreciated as that's mainly what I'm after. Ta muchly, Andrew K >> Considering the %age of desk-top. apps that *can* >> be deployed using web start, I'd prefer to deal with [quoted text clipped - 6 lines] > > Patricia, what was your case/where is it located if I may peek? It was discussed in a previous thread in this newsgroup. See http://groups.google.com/group/comp.lang.java.programmer/msg/2fdc49fc5086d2eb I have a simulation program that I use in my research. I am both developer and the only end user. Each run is very simple - it reads an XML parameter file and generates an XML report. The difficulty is that individual runs can take several hours, and I frequently need to do blocks of about a hundred runs. I have various tools that build sets of parameter files and process the results. Bulk runs are done on a grid computer, using a qmake utility that acts like a parallel make, but pushes the tasks to the grid's run queues. I am allowed to have up to 64 runs at any one time. Obviously, this all has to be automated to be practical. I only look at individual results if I see some anomaly in bulk reports that compare results from a large set of runs. Normally, each run turns into a point in each of a couple of charts. Patricia >I would like to be able to extract them from the Java app straight out >of the JAR - and for this I need to know what the name of the JAR file >invoked was (it might have been renamed for X reasons) You don't need to know the name of the jar to extract data members. See http://mindprod.com/jgloss/resource.html If you need to know the name of the jar for some other reason, you could look at the classpath in the System.Properties see http://mindprod.com/jgloss/properties.html Then examine each jar on the classpath to see if it contains your stuff. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com >I would like to be able to extract them from the Java app straight out >of the JAR If you want to unpack jars and install files on the local hard disk, use Java Web Start. Have a look how The Esperanto Traduiklo does this with the Installer class. See http://mindprod.com/products2.html#ESPER SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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