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Grant
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 Posted: Tue Nov 18, 2008 7:40 am Post subject: [gentoo-user] Java "bad version number" - what to up/downgra |
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I'm getting the following from dumphd:
"bad version number in .class file"
I gather that I may have the wrong version of something Java installed
but I don't know how that works. Can anyone tell me what package I
should try upgrading or downgrading?
- Grant |
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Shawn Haggett
Guest
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| Posted: Tue Nov 18, 2008 8:10 am Post subject: Re: [gentoo-user] Java "bad version number" - what to up/dow |
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On Tue, 18 Nov 2008 12:04:53 pm Grant wrote:
| Quote: | I'm getting the following from dumphd:
"bad version number in .class file"
I gather that I may have the wrong version of something Java installed
but I don't know how that works. Can anyone tell me what package I
should try upgrading or downgrading?
|
This normally means the class file is from a new version of Java then the
virtual machine trying to run it (i.e. class files compiled under Java 1.5,
but your trying to run it in Java 1.4).
"java-config -L" (without quotes) will show you what virtual machines you have
installed. On my machine it shows (the asterisk is the currently selected
one, i.e. what will be used to run java applications):
podge@venus ~ $ java-config -L
The following VMs are available for generation-2:
1) Blackdown JDK 1.4.2.03 [blackdown-jdk-1.4.2]
2) Sun JDK 1.5.0.16 [sun-jdk-1.5]
*) Sun JDK 1.6.0.07 [sun-jdk-1.6]
podge@venus ~ $
If the newest VM isn't selected as the default, read the man page for
java-config and tell it to set the newest one as default (1.6 is the newest
version).
Shawn |
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Shawn Haggett
Guest
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| Posted: Tue Nov 18, 2008 8:29 am Post subject: Re: [gentoo-user] Java "bad version number" - what to up/dow |
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On Tue, 18 Nov 2008 02:56:57 pm Grant wrote:
| Quote: | I'm getting the following from dumphd:
"bad version number in .class file"
I gather that I may have the wrong version of something Java installed
but I don't know how that works. Can anyone tell me what package I
should try upgrading or downgrading?
This normally means the class file is from a new version of Java then the
virtual machine trying to run it (i.e. class files compiled under Java
1.5, but your trying to run it in Java 1.4).
"java-config -L" (without quotes) will show you what virtual machines you
have installed. On my machine it shows (the asterisk is the currently
selected one, i.e. what will be used to run java applications):
podge@venus ~ $ java-config -L
The following VMs are available for generation-2:
1) Blackdown JDK 1.4.2.03 [blackdown-jdk-1.4.2]
2) Sun JDK 1.5.0.16 [sun-jdk-1.5]
*) Sun JDK 1.6.0.07 [sun-jdk-1.6]
podge@venus ~ $
If the newest VM isn't selected as the default, read the man page for
java-config and tell it to set the newest one as default (1.6 is the
newest version).
Shawn
Thank you very much. Since I'm not a Java developer, do I want jre as
opposed to jdk?
- Grabt
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Yeah, the JRE will be fine. The important thing is just which version is
active. I do Java development, hence the JDK.
Shawn |
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Grant
Guest
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| Posted: Tue Nov 18, 2008 8:29 am Post subject: Re: [gentoo-user] Java "bad version number" - what to up/dow |
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| Quote: | I'm getting the following from dumphd:
"bad version number in .class file"
I gather that I may have the wrong version of something Java installed
but I don't know how that works. Can anyone tell me what package I
should try upgrading or downgrading?
This normally means the class file is from a new version of Java then the
virtual machine trying to run it (i.e. class files compiled under Java 1.5,
but your trying to run it in Java 1.4).
"java-config -L" (without quotes) will show you what virtual machines you have
installed. On my machine it shows (the asterisk is the currently selected
one, i.e. what will be used to run java applications):
podge@venus ~ $ java-config -L
The following VMs are available for generation-2:
1) Blackdown JDK 1.4.2.03 [blackdown-jdk-1.4.2]
2) Sun JDK 1.5.0.16 [sun-jdk-1.5]
*) Sun JDK 1.6.0.07 [sun-jdk-1.6]
podge@venus ~ $
If the newest VM isn't selected as the default, read the man page for
java-config and tell it to set the newest one as default (1.6 is the newest
version).
Shawn
|
Thank you very much. Since I'm not a Java developer, do I want jre as
opposed to jdk?
- Grabt |
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| |
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| Back to top |
Grant
Guest
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| Posted: Wed Nov 19, 2008 9:40 pm Post subject: Re: [gentoo-user] Java "bad version number" - what to up/dow |
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| Quote: | I'm getting the following from dumphd:
"bad version number in .class file"
I gather that I may have the wrong version of something Java installed
but I don't know how that works. Can anyone tell me what package I
should try upgrading or downgrading?
This normally means the class file is from a new version of Java then
the
virtual machine trying to run it (i.e. class files compiled under Java
1.5, but your trying to run it in Java 1.4).
"java-config -L" (without quotes) will show you what virtual machines
you
have installed. On my machine it shows (the asterisk is the currently
selected one, i.e. what will be used to run java applications):
podge@venus ~ $ java-config -L
The following VMs are available for generation-2:
1) Blackdown JDK 1.4.2.03 [blackdown-jdk-1.4.2]
2) Sun JDK 1.5.0.16 [sun-jdk-1.5]
*) Sun JDK 1.6.0.07 [sun-jdk-1.6]
podge@venus ~ $
If the newest VM isn't selected as the default, read the man page for
java-config and tell it to set the newest one as default (1.6 is the
newest version).
Shawn
Thank you very much. Since I'm not a Java developer, do I want jre as
opposed to jdk?
- Grabt
Yeah, the JRE will be fine. The important thing is just which version is
active. I do Java development, hence the JDK.
Shawn
|
Can you tell me the best way to Gentoo all of this? I've now got:
# java-config -L
The following VMs are available for generation-2:
1) Sun 32bit JRE 1.6.0.07 [emul-linux-x86-java-1.6]
2) Sun JDK 1.5.0.16 [sun-jdk-1.5]
*) Sun JDK 1.6.0.07 [sun-jdk-1.6]
and dev-java/sun-jdk in my world file, and it wasn't there before.
Also, emerge world wants to install virtual/jre-1.6.0 and
virtual/jdk-1.6.0. Should I un-emerge sun-jdk-1.5?
- Grant |
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