Plugin Problems (Possibly Mac problem?)

Hey guys, running CraftBukkit on my mac and I can't seem to install any plugins? A very minor select few work, however the majority gives me pretty much the same error, e.g. this one from TimeShift:

Code:

[SEVERE] Could not load 'plugins/TimeShift.jar' in folder 'plugins':
java.lang.UnsupportedClassVersionError: Bad version number in .class file
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:676)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:36)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:317)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:375)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:242)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:134)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:160)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:108)
    at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:85)
    at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:217)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:204)
    at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:144)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:259)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:394)

I'm currently running CraftBukkit build 766 but I have also reinstalled and tried with 740. This happens with the majority of plugins, possibly because I am unable to use the latest version of java on my architecture.


Mac OS X 10.5.8
PowerPC G5 Architecture Dual Core 64 Bit.
Java Version: 1.5.0_28

 

Update your Java to 1.6.

Edit - I just saw your note at the bottom. Why wouldn't you be able to use the latest version of Java? It isn't machine dependent.

 

Apple has to provide the build, and I don't think they support the PowerPC based Macs any longer.

You could work around the issue by running a virtual machine where you have Java 1.6_25 installed.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

There are some unofficial Java 1.6 projects for PPC. I haven't used any of them and can't vouch for their workingness.

http://landonf.bikemonkey.org/static/soylatte/#get

http://wikis.sun.com/display/OpenJDK/BSDPort

I'm downloading the 1.5 JDK to see if it's even possible to build TimeShift with it. If I remember correctly, it won't work though.

 

I've tried OpenJDK 7 for PPC however it crashes the server midway through launch (just freezes). I am unable to try OpenJDK 6 and as far as I know it only compiles on Intel.

TBK, what would you recommend for virtual machines bearing in mind I don't have Intel at the moment?

 

I only know of http://www.microsoft.com/australia/office/mac/virtualpc7/default.aspx

 

Nah that's useless. I might as well just get a new computer, no worries.

 

There is a workaround for this.

1. Download the last Java Update for Leopard.
2. Go to spotlight (magnifying glass in the top right corner)
3. Type "Java Preferences"
4. Select "Java Preference"
5. Uncheck "J2SE 5.0" and leave "Java SE 6" checked.
6. Run server.
7. Wait for Terminal to say "done"
8. Re-check "J2SE 5.0"
9. Open Minecraft
10. Enter Server
11. Profit!

NOTE: You must have "J2SE 5.0" unchecked to start the server properly and then you must re-check it after the server has loaded. Minecraft WILL NOT RUN without "J2SE 5.0" checked.

It's a pain I know, but you get the hang of it.

 

Alright thanks! I'm going to try it now. Also if I move 6 above 5 and check both do you think I won't have to repeatedly switch it?

 

Hmm.. it never occurred to me. Let me test it now

EDIT: Looks like it works!

 

As I was worried about, Java SE 6 does not appear in Java Preferences. /System/Library/Frameworks/JavaVM.framework/Versions contains 1.6, however and I will try something.

EDIT: Didn't work (Bad CPU Type). Which means the Java 6 on my machine is written for a newer system which I don't have :/

 

@Relick

Could you tell me if this version of TimeShift works for you (Using the Java you have, preferably without plugins that do cause the issue)?

 

It setup up fine and it says TimeShift 2.0 or whatever is activated.

It also works perfectly in regards to setting day or night ('shift day world'), but when changing it using 'shift startup day world' (as an example) I get:

Code:

[WARNING] Unexpected exception while parsing console command
org.bukkit.command.CommandException: Unhandled exception executing command 'shift' in plugin TimeShift v2.0.1_jre-1.5
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:37)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:85)
    at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:247)
    at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:394)
    at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:379)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:285)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:394)
Caused by: java.lang.NullPointerException
    at tazzernator.cjc.timeshift.TimeShiftPersistentReaderWriter.persistentWriter(TimeShiftPersistentReaderWriter.java:80)
    at tazzernator.cjc.timeshift.TimeShiftCommandParser.setPersist(TimeShiftCommandParser.java:30)
    at tazzernator.cjc.timeshift.TimeShiftCommandParser.handleCommand(TimeShiftCommandParser.java:239)
    at tazzernator.cjc.timeshift.TimeShift.onCommand(TimeShift.java:184)
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:35)
    ... 6 more

Although I really thank you for allowing me to use this plugin. It's a great help

 

Whoops -- my local source copy was 1 revision out of date. The same link now points to a version that should work.

Since this works, it seems one possible solution is to recompile plugins for Java 1.5, which should be possible as long as no 1.6 features are used.

It's certainly not an entirely ideal solution, but you may want to learn to compile plugins from source.

That won't work in all cases since not everyone provides source, but if you run out of other options, you may wish to give it a try.

 

Alright thanks, you have been an amazing help. Usually if there is a plugin without a source, they'll be another which does the same thing with a source so I'm good in most cases.

Problem solved guys

 

Wuhuu