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6 Replies Latest reply: Nov 30, 2012 2:55 PM by EJP RSS

Invalid MAGIC number in jar file

mh*379860*ly Newbie
Currently Being Moderated
HI Gentlemen,

I just compiled a java file into a class file and then set up a jar file with that one single class. Manifest indicates that the Java version is 1.7.0 as is any other development tool. Now I am inspecting the file with my hex editor and it does not contain CAFEBABE as a magic number. However, a legacy jar file in an Applet sample code has it and works correctly. It was as well with my JDK 1.7.0 compiled. What can be wrong with my method? JDeveloper does not accept the jar when I want to deploy and call the applet.

Please help if you can.

Many thanks in advance, kindly regards

Miklos HERBOLY
  • 1. Re: Invalid MAGIC number in jar file
    gimbal2 Guru
    Currently Being Moderated
    Perhaps your JDeveloper is simply not configured to support Java 7?
  • 2. Re: Invalid MAGIC number in jar file
    mh*379860*ly Newbie
    Currently Being Moderated
    No, sorry--by looking into JDeveloper configuration it always says Java 1.7.0. This because I started with changing the shipped Java 6 to Java 7.
    WHat else can it be?

    Thanks, regards

    Miklos
  • 3. Re: Invalid MAGIC number in jar file
    gimbal2 Guru
    Currently Being Moderated
    With the current lack of in information provided - impossible to know.
  • 4. Re: Invalid MAGIC number in jar file
    mh*379860*ly Newbie
    Currently Being Moderated
    HI gimbal2,

    Thank you for your reply. Just to start with, I included here some stuff.
    (i) JDeveloper parameters
    About
    -----
    
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    Studio Edition Version 11.1.1.6.0
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    Copyright © 1997, 2011 Oracle and/or its affiliates. All rights reserved.
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    (ii) The beginning portion of my jar file as output by the hex editor
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
    (iii) Contents of MANIFEST.MF
    Manifest-Version: 1.0
    Created-By: 1.7.0 (Oracle Corporation)
    (iv) The error message as it appears
    *ClassFormatError*
    Incompatible magic value 1013478509 in class file D001Applet
    I know that searching a stuff as the hex output is tedious; however, I did it and did not find the value 0xCAFEBABE, the magic value.
    Please let me know if this helped or if you need some further info.

    Thanks, regards,

    Miklos
  • 5. Re: Invalid MAGIC number in jar file
    DrClap Expert
    Currently Being Moderated
    >
    Incompatible magic value 1013478509 in class file D001Applet
    I know that searching a stuff as the hex output is tedious; however, I did it and did not find the value 0xCAFEBABE, the magic value.
    However 1013478509 is decimal, not hexadecimal. Converting to hex gives 3C68746D. And converting that to ASCII gives "<htm".

    So what is in your JAR file masquerading as a Java class is actually a text file starting with those four characters. Look in the JAR and you should be able to see that.
  • 6. Re: Invalid MAGIC number in jar file
    EJP Guru
    Currently Being Moderated
    More likely it is an HMTL error page. Check your HTML applet tag and file locations. Check that browsing to the effective JAR URL does download the JAR.

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