Could not load plugins

Hi guys, I am starting my server and most of the plugins that I downloaded aren't working well
or they are broken for some reason.

here is the console:

[23:38:07 ERROR]: Could not load 'plugins\Factions.jar' in folder 'plugins'
org.bukkit.plugin.UnknownDependencyException: mcore
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:216) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugins(CraftServer.ja
va:350) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.<init>(CraftServer.java:31
2) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at net.minecraft.server.v1_7_R1.PlayerList.<init>(PlayerList.java:63) [c
raftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at net.minecraft.server.v1_7_R1.DedicatedPlayerList.<init>(SourceFile:14
) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.jav
a:126) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:424) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]

and this is the second one

[23:39:27 ERROR]: Could not load 'plugins\mcore.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError
: com/massivecraft/mcore/MCore : Unsupported major.minor version 51.0
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:131) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:328) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:251) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugins(CraftServer.ja
va:350) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at org.bukkit.craftbukkit.v1_7_R1.CraftServer.<init>(CraftServer.java:31
2) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at net.minecraft.server.v1_7_R1.PlayerList.<init>(PlayerList.java:63) [c
raftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at net.minecraft.server.v1_7_R1.DedicatedPlayerList.<init>(SourceFile:14
) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.jav
a:126) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:424) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
Caused by: java.lang.UnsupportedClassVersionError: com/massivecraft/mcore/MCore
: Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.6.0_20]
at java.lang.ClassLoader.defineClassCond(Unknown Source) ~[?:1.6.0_20]
at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.6.0_20]
at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.6.0
_20]
at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.6.0_20]
at java.net.URLClassLoader.access$000(Unknown Source) ~[?:1.6.0_20]
at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.6.0_20]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.6.0_
20]
at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.6.0_20]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:77) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.6.0_20]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.6.0_20]
at java.lang.Class.forName0(Native Method) ~[?:1.6.0_20]
at java.lang.Class.forName(Unknown Source) ~[?:1.6.0_20]
at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:40) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:127) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]

please reply quick so I can know what to do with it..
thanks for the help

 

You need to have the MCore plugin in order to use Factions. Here's the download link for MCore for 1.7.2: http://dev.bukkit.org/media/files/773/413/mcore.jar

 

JWhy dude I have MCore scroll up to see it, Its the second plugin and it won't work too

 

Oh sure, missed that. It says

which means you're using a JRE below JRE7, so you should update to JRE7:
http://www.oracle.com/technetwork/java/javase/downloads/java-se-jre-7-download-432155.html

 

it might be the solution but... my JRE that should have been updated, didnt worked at all. I mean, I updated it and it says that JRE7 is losing some files or something like that. what should I do now?

 

Use an older version of Factions then I guess. I use the last one before MCore was required which is Faction 1.8.2 and it might not require JRE 1.7

 

LHammonds then how about the MCore? should I use the old version too?

 

There's no telling if a plugin requires Java 1.6 or Java 1.7 unless the author tells you "OR" you test it and find out yourself.

If an author compiles their plugin using Java Development Kit 1.6, it "should" work on any server running JRE 1.6 or 1.7

But if they compile it with JDK 1.7, servers running JRE 1.6 will not work.

 

LHammonds ok thanks, maybe Ill try tomorrow, its pm here )

 

mightydespair: Replace

Code:

java -Xms1G -Xmx2G -jar craftbukkit.jar

in your start up command by

Code:

"C:\Program Files\Java\jre7\bin\java" -Xms1G -Xmx2G -jar craftbukkit.jar

That will force the usage of JRE 7 (if it's installed at that location, which should be the case if you didn't manually specify another installation destination)

 

JWhy I did it but the console says


C:\Users\User\AppData\Roaming\.minecraft\Troller'sCraft>C:\Program Files\Java\jr
e7\bin\java" -Xms1G -Xmx2G -jar craftbukkit.jar
'C:\Program' is not recognized as an internal or external command,
operable program or batch file.

C:\Users\User\AppData\Roaming\.minecraft\Troller'sCraft>PAUSE
Press any key to continue . . .

 

For the "C:\Program" is not recognized...that tells me you did not enclose the path to java in quotes. Be sure to surround the full path to java.exe in quotes exactly like JWhy quoted. The -Xms and other parameters will be outside the quoted part.

It might also not like the apostrophe in Troller'sCraft

I recommend putting your server folder someplace like C:\CraftBukkit\craftbukkit.jar

EDIT: And just for the heck of it, here is a copy of my batch file I use when starting up local servers on my Windows PC. The only part you might need to customize is line #2 for the amount of RAM to use and line #3 for the path to the server jar file. The batch file will prefer to run JRE 1.7 over 1.6 and prefer 64-bit java over 32-bit java. Works on 32-bit or 64-bit machines alike.

Startcb.bat

Code:

@ECHO OFF
SET RAM2USE=2048
CD /D C:\CraftBukkit

REM ** Look for a version of Java 7 that matches the OS (32-bit for 32-bit, 64-bit for 64-bit) **
IF EXIST "%ProgramFiles%\Java\jre7\bin\java.exe" GOTO JAVA7DEFAULT

REM ** Look for 32-bit version of Java 7 on 64-bit OS **
IF EXIST "%ProgramFiles(x86)%\Java\jre7\bin\java.exe" GOTO JAVA732BIT

REM ** Look for a version of Java 6 that matches the OS (32-bit for 32-bit, 64-bit for 64-bit) **
IF EXIST "%ProgramFiles%\Java\jre6\bin\java.exe" GOTO JAVA6DEFAULT

REM ** Look for 32-bit version of Java 6 on 64-bit OS **
IF EXIST "%ProgramFiles(x86)%\Java\jre6\bin\java.exe" GOTO JAVA632BIT

:JAVA7DEFAULT
REM ** This will execute if run on a 32-bit OS with a 32-bit version of Java 7 **
REM ** This will execute if run on a 64-bit OS with a 64-bit version of Java 7 **
"%ProgramFiles%\Java\jre7\bin\java.exe" -XX:MaxPermSize=128M -Xmx%RAM2USE%M -Xms%RAM2USE%M -jar craftbukkit.jar nogui
GOTO DONE

:JAVA732BIT
REM ** This will execute if run on a 64-bit OS with only a 32-bit version of Java 7 **
"%ProgramFiles(x86)%\Java\jre7\bin\java.exe" -XX:MaxPermSize=128M -Xmx%RAM2USE%M -Xms%RAM2USE%M -jar craftbukkit.jar nogui
GOTO DONE

:JAVA6DEFAULT
REM ** This will execute if run on a 32-bit OS with a 32-bit version of Java 6 **
REM ** This will execute if run on a 64-bit OS with a 64-bit version of Java 6 **
"%ProgramFiles%\Java\jre6\bin\java.exe" -XX:MaxPermSize=128M -Xmx%RAM2USE%M -Xms%RAM2USE%M -jar craftbukkit.jar nogui
GOTO DONE

:JAVA632BIT
REM ** This will execute if run on a 64-bit OS with only a 32-bit version of Java 6 **
"%ProgramFiles(x86)%\Java\jre6\bin\java.exe" -XX:MaxPermSize=128M -Xmx%RAM2USE%M -Xms%RAM2USE%M -jar craftbukkit.jar nogui
GOTO DONE

:DONE
REM ** This will pause the screen so you can see any error messages after stopping the CraftBukkit server. **
PAUSE

LHammonds

 

what do you mean by that? how do I enclose the path to java?

 

We have given you a ton of examples. Surround the path to java.exe in QUOTES which are --> " <-- but do not include the parameters after java.exe inside the quotes. Just look our examples.

Correct:
"C:\Program Files\Java\jre7\bin\java" -Xms1G -Xmx2G -jar craftbukkit.jar

Incorrect:
C:\Program Files\Java\jre7\bin\java -Xms1G -Xmx2G -jar craftbukkit.jar
"C:\Program Files\Java\jre7\bin\java -Xms1G -Xmx2G -jar craftbukkit.jar"

 

ohh so that means that if I add --> " <-- It means that will work for me?

LHammonds dude, I replaced it with --> " <-- then this is the result


C:\Users\User\AppData\Roaming\.minecraft\Craftbukkit>"C:\Program Files\Java\jre7
\bin\java" -Xms1G -Xmx2G -jar craftbukkit.jar
Error occurred during initialization of VM
Could not reserve enough space for object heap
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

C:\Users\User\AppData\Roaming\.minecraft\Craftbukkit>PAUSE
Press any key to continue . . .

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

 

Code:

"C:\Program Files\Java\jre7\bin\java" -Xms256M -Xmx1G -jar craftbukkit.jar

That will make your JRE VM use less memory. But how much memory does your machine have installed? And are you using the 64 bit version of JRE7?

 

Idk how much my memory... yes I do have FRE7 but I think something just haven't done/ downloaded yet... I mean idk if its totally JRE7

 

Mcore does not go in your plugins folder. Put it in the main directory and reply back with the result.

 

mightydespair go into your system in the control panel. From their you should be able to see your Java and how much RAM you have.

 

Try this then...I was cleaning up your example...use mine instead:

Code:

"C:\Program Files\Java\jre7\bin\java.exe" -XX:MaxPermSize=128M -Xmx2048M -Xms2048M -jar craftbukkit.jar nogui

The above is giving 2 gigabytes of RAM to Minecraft.

If you don't have that much to give, try the following line which is only 1 gigabyte (e.g. 1024 megabytes)

Code:

"C:\Program Files\Java\jre7\bin\java.exe" -XX:MaxPermSize=128M -Xmx1024M -Xms1024M -jar craftbukkit.jar nogui

If that still does not work and its giving you errors, reboot your PC and try again.

If it continues to be problematic after that, uninstall all versions of Java. Then install the latest version (JRE 1.7.0 Update 55 - At the time of this post)

If you have a 64-bit system, it is recommended you install both the 32-bit and 64-bit versions of Java.

LHammonds