Jennek Geels

Hi,
maybe this has been asked before, but I am still a bit puzzled by the  
new forums and
the way they are to be searched

I am moving my java development from the quickie environment to eclipse.
Classes that were OK in quickie fail to compile in eclipse.
Error message "MaxObject cannot be resolved to a type"

I have included as 'external jars' in the Build Path for my project
   /Library/Application Support/Cycling '74/java/lib/jitter.jar
    /Library/Application Support/Cycling '74/java/lib/jode-1.1.2-pre- 
embedded.jar
    /Library/Application Support/Cycling '74/java/lib/max.jar
and in the package explorer from eclipse I can see MaxObject.class
in package 'com.cycling74.max' in file 'max.jar' in '/Library/ 
Application Support/Cycling '74/java/lib/'

the .java files begins with
"import com.cycling74.max.*;"

I am on:
Eclipse 3.1
Java 5.0
MaxOS 10.4.4
Max 4.5.5

I am new to eclipse, and have only begun to explore java recently.
However, I have worked with OO and IDEs for a loong time.
My motivation for moving to eclipse is to include my Swing based code  
fragments
into mxj classes.

eclipse-maxobject-cannot-be-resolved-to-a-type

I can't see anything obviously wrong with what you've done in terms  
of setup. (You don't need Jode, by the way.) I've tested in my  
Eclipse setup, and the error message does indeed seem to be a compile- 
time "name not found" error.

> the .java files begins with
> "import com.cycling74.max.*;"

If you replace this with an explicit import of  
com.cycling74.max.MaxObject, what happens?

   nick rothwell -- composition, systems, performance -- http:// 
www.cassiel.com


That does the trick. I have to include all the types I use  
explicitly. Like:

import com.cycling74.max.MaxObject;
import com.cycling74.max.Atom;
import com.cycling74.max.DataTypes;

Hm. Funny this expansion is required.
Anyway, I can move on now.
Thanks!
-jennek


Well if that does the trick, then there's something wrong somewhere.  
I've just had a flick through the Java Language Specification, and  
see no reason why a "com.cycling74.max.*" should not pick up all of  
the above. (I thought there might be some semantic subtlety related  
to classpath construction, but there isn't.) I tried it in my Eclipse  
setup, and can use "*" or the fixed name without any problems.

Fancy posting some of your source code? There maybe something odd in  
there that you've missed.

Sure, but...
As I tried to isolate a snippet of code demonstrating the problem,
the error message went away. When I loaded the original full source,
the problem did not return. everything builds and runs nicely now.

A veritable heisenbug: once you start looking for it, it vanishes.

On 23 Jan 2006, at 20:01, jennek geels wrote:

> As I tried to isolate a snippet of code demonstrating the problem,
> the error message went away.

Eclipse sometimes does that, and you have to clean and rebuild the  
class files. Don't know why.

Since I upgraded to Eclipse 3.1 I sometimes have the same problem.  I think it is a bug.  Relaunching the environment seems to fix the compilation errors.  I'm going to try to downgrade. 

I never had any kind of troubles with 3.1.1. Why don't you don't move to 
it ? Notice that there's a 3.1.2 since a week. I didn't installed it yet 
because i haven't find any insurance of CDT 3.0.1 compatibility with, 
but a lots of bugs were fixed for Java only. Take a look.

Anyway, did you tried to check the box of the max.jar in the Order And 
Export Pane in the Java Build Path properties ? It fixed a lot of 
"linking" problems for me.

Hi! i have this error << The type com.cycling74.max.MaxObject is not accessible >> at the beginning import line of every single class in eclipse, while trying to revive my old big modular instrument*   

max.jar is in the eclipse libraries of the eclipse java project (in classpath)  ...i'm a bit lost as i was never super familiar with eclipse

OK I got rid of the errors in eclipse by checking all the boxes of the jars in “order and export” in the java build path tab… ... They were unchecked I don’t know why, even if the libraries were already there in the tab library, a bit mysterious all of this, but the errors disappeared )

eclipse: "MaxObject cannot be resolved to a type"

Alexandre

Hi! i have this same error << The type com.cycling74.max.MaxObject is not accessible >> at the beginning import line of every single class in eclipse, while trying to revive my old big modular instrument* 

max.jar is in the eclipse libraries of the eclipse java project (in classpath)  ...i'm a bit lost as i was never super familiar with eclipse 

Hi! i have this same error << The type com.cycling74.max.MaxObject is not accessible >> at the beginning import line of every single class ... 

eclipse-the-type-com-cycling74-max-maxobject-is-not-accessible

Eclipse: << The type com.cycling74.max.MaxObject is not accessible >> 

Hi! I need to use some old patch using mxj/java (and just installed the last max8 on a brand new macOS 12.5), but it seems that Max cannot use any mxj object:

Even for the ones from mxj.maxhelp, max console says:

'Cannot get_java_vm'
'Unable to create JVM'

Thanks a lot in advance for your help, since it's a super important patch* that really need to open and use again <3 
🙏❤️🙏❤️🙏❤️🙏❤️🙏❤️

(*Patch of possible trajectories of mecanical puppets legs tunnings that i need to rebuilt: alexbart.org/puppet)

Hi! I need to use some old patch using mxj/java (and just installed the last max8 on a brand new macOS 12.5), but it seems that Max cannot ... 

'cannot-get_java_vm'-and-'unable-to-create-jvm'

https://www.java.com/en/download/

https://www.java.com/en/download/help/mac_install.html

https://www.java.com/en/download/help/disable_offers.html


Thank you, I installed this (and restarted my mpb) but it does not change: Same errors in max console... ? 🙏

(Note: Just to notice, even if this might not be a big deal: The 'Suppress sponsor offers when updating Java' checkbox is not there anymore in the advanced session of the Java Control Panel in system preferences)

 OK I figured out that i needed to install aswell the "Arm 64 DMG" at  https://www.oracle.com/java/technologies/downloads/#jdk19-mac ... and now mxj objects are working!

Still have few strange bugs in my java class... ... .... What would be the simpliest way to recompile a java class after a very small modification?  ... ( it's like 10 years i didn't use java/mxj and i'm completly lost i forgot everything :-D ... (not sure i wanna go through the whole eclipse instalation thing, not even sure it is still a thing))

'Cannot get_java_vm' and 'Unable to create JVM'

j kuprys

I've got a patch built on Javascript from my Masters Thesis; it runs well enough but I want to push it further. Sadly, the performance is holding it back so I'd like to translate it to Java. The script by itself isn't anything too complex, it's mostly just pulling data and doing horrendous amounts of math. I'm reading up on Java and trying to teach myself, but atm I'm struggling to get any Java class to run in Max MSP. 

I'm consulting the documentation for Max-MXJ that comes with the package to figure out how to work with the mxj object and translate my script, but whenever I try to compile a simple hello world message I get the error:

java.lang.UnsupportedClassVersionError: bongo has been compiled by a more recent version of the Java Runtime (class file version 63.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at com.cycling74.max.MXJClassLoaderImpl.doLoadClass(MXJClassLoaderImpl.java:117)
at com.cycling74.max.MXJClassLoader.loadClazz(MXJClassLoader.java:88)

To my understanding, it's telling me that the compiler version I've been using is wrong, yet I'm running the latest JavaSE version. Having looked up the class file versions, 52 would imply JavaSE 8?


My question is this: Should I just downgrade my local version of JavaSE or is there some trick I'm missing here? Any further advice on working with Java in Max MSP would be appreciated!

I'm running Win10 and the latest version of Max MSP if that makes any difference. 

Hi,
I've got a patch built on Javascript from my Masters Thesis; it runs well enough but I want to push it further. 

getting-started-with-java

<quote>My question is this: Should I just downgrade my local version of JavaSE or is there some trick I'm missing here? Any further advice on working with Java in Max MSP would be appreciated!
</quote>
This shouldn't be necessary. Depending on the IDE you're using, you should be able to select an older JRE version to work with. We just managed to get it running on a student's windows laptop the other day, using Eclipse (Project Properties > Java Build Path) - if I remember well, we had to go back to JRE 1.6.
hth


The Java compiler supports options to build classes that are compatible with older runtime versions. If you're compiling using javac on the command line, you can pass the option '-target 8'.

Getting Started With Java

cortexproductions

Hi folks ! 
after a lot of research on this forum, I didn't found a correct system to control beamer with PJlink protocol... 

I found a java program on this : http://www.diecyde.com/index.php?page=pjlink-beamer-control
Its under GPLv2 License 

I tuned up it and modifed it to work with " mxj " function 
It is very simple to use it and it's light. 

here is the patch code that work with the java external PJlinkConnect : 

PjlinkConnect.maxpat

MXJ-PjlinkConnect.zip

Hi folks ! 
after a lot of research on this forum, I didn't found a correct system to control beamer with PJlink protocol... 
I found a java

working-pjlink-control-mxj-object-!

Hello,
I'm trying to use this patch without success.
I've installed Java, but when I'm trying to connect to a videoprojector nothing happens. 
Instead I read this message in the console :
"(mxj warning)strange coercion: max numeric (long) forced to symbol."
and 
"Receive-Projector: "PJLINK ERRA""

working PJlink Control mxj object ! 

Hi, keep in mind I am an absolute beginner to Max for live and Java. 

I have found a project "hack of Emmanuel Jourdan's waveformcirc" and I would like to change some things in the .java file. The problem is that it needs to be compiled, and I tried with my local java in PowerShell (windows 10) and my java can't find the two import com.cycling74.max.*; import com.cycling74.msp.*;. Can you tell me if I can use the mxj compile window of max, I can't make it work with my .java file, and which compiler command should I use? I can't find javac and have 2 java.exe one in JRE and one in JDK. 

Hi, keep in mind I am an absolute beginner to Max for live and Java. 
I have found a project "hack of Emmanuel Jourdan's waveformcirc" and I

how-to-compile-a-java-file-with-max

you can compile it in max,
just send message viewsource to mxj object, and from there it is
simple to proceed.
If you are into reading docs, you will find all in max-mxj package


How to compile a .java file with max

Chris

My goal: running Processing.org (version 3.5.4) from within Max 8 through writing an mxj external  on Windows 10, 64 . I want to open a Processing test sketch window from within Max sending a bang message to the mxj external. For this I have 
class MaxJavaTest3 extends MaxObject which calls 
class TestProcessing extends PApplet. 

   public class MaxJavaTest3 extends MaxObject {
       public void bang() {
            String[] args = {};
            TestProcessing.main(args);
        }
    } 

   public class TestProcessing extends PApplet {
       public static void main(String args[] ) {
          PApplet.main("TestProcessing", args);
        } 

       public void settings() {        
            size(920, 780); 
        }

       public void setup() {        
            background(0);
            fill(255, 0, 0);
            circle(width/2, height/2, 80);        
        }
    }

In IntelliJ I set the dependencies for Max and Java. The bang message is received in Java e.g. triggering some text messages to the console. If I execute PApplet.main via the entry point TestProcessing.main, the processing window opens. So far so good, but trying to invoke PApplet.main via MaxJavaTest3.bang() method I get the error: 

java.lang.RuntimeException: java.lang.ClassNotFoundException: TestProcessing
	at processing.core.PApplet.runSketch(PApplet.java:10852)
	at processing.core.PApplet.main(PApplet.java:10657)
	at TestProcessing.main(TestProcessing.java:11)
	at MaxJavaTest3.bang(MaxJavaTest3.java:19)
Caused by: java.lang.ClassNotFoundException: TestProcessing
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	at processing.core.PApplet.runSketch(PApplet.java:10845)
	... 3 more

I tried out different paths for the .jar dependencies but no success. I add here the relevant parts of my max.java.config.txt for reference:

; add all jars in /Users/topher/java/lib to the system classpath i.e. immutable classpath ;
max.system.jar.dir "C:/Users/CLEVO Computer/Documents/Java/lib"

; add /Users/topher/myclasses to the dynamic classpath of MXJClassLoader ;
max.dynamic.class.dir "C:/Users/CLEVO Computer/Max_Java_Test/MaxJavaTest3/out/production/MaxJavaTest3"

; specify some jvm options ;
max.jvm.option -Xincgc
max.jvm.option -Xms64m
max.jvm.option -Xmx256m

My goal: running Processing.org (version 3.5.4) from within Max 8 through writing an mxj external  on Windows 10, 64 . I want to open a Proc

dependency-not-found-error

Dependency not found error

matmat

Hi,
I  installed the Java jdk-12.0.1 for windows-x64 .
In the windows command line i verified the Java version :
 : C:\Users\XXX>java -version java version "12.0.1" 2019-04-16 Java(TM) SE Runtime Environment (build 12.0.1+12) Java HotSpot(TM) 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)  

But in Max8 when i load an mxj  i've this message  : mxj: could not find Java 2 Runtime Environment. Error loading:  (mxj) mxj_platform_init failed. Could not initialize the Java Runtime Environment. Please check your Java installation.  java.sun.com Unable to create JVM 

Hi,
I  installed the Java jdk-12.0.1 for windows-x64 .
In the windows command line i verified the Java version :
 : C:\Users\XXX>java -versi

java-jdk-12-0-1_windows-x64_bin-problem

I am on macOS and running Java 8 Update 221. Maybe try to install an earlier version of Java (from C74 side mxj/java is in maintenance mode, meaning it does not receive updates, they just try to keep it running as is)

in my recherche about mxj I found this post and supposed from it that it is not possible to run an actual java version with mxj.  Meanwhile I installed JDK 18 successfully on my machine with Windows 10.   Here is a more detailed description https://github.com/tecartlab/max-mxj/wiki/Install-Open-JDK13

Java jdk-12.0.1_windows-x64_bin  problem

Valerio Sannicandro

Hello
can anybody tell me which Java package shall I download on my Macbook pro (M1 OS 12.2 Monterey) to run max8? (not for developer). If you also could provide a link would be great!
Thanks!


Hello
can anybody tell me which Java package shall I download on my Macbook pro (M1 OS 12.2 Monterey) to run max8? (not for developer). If y

download-java-package-for-max8-not-developer

download Java package for max8 (not developer)

Hi,  
could you please let me know the actual version of Java which is supported to write mxj externals.
Best wishes
C

Cycling '74 Forums

OK I got rid of the errors in eclipse by checking all the boxes of the jars in “order and export” in the java build path tab… ...

OK I got rid of the errors in eclipse by checking all the boxes of the jars in “order and export” in the java build path tab… ...

OK I figured out that i needed to install aswell the "Arm 64 DMG" at https://www.oracle.com/java/technologies/downloads/#jdk19-mac ...

The Java compiler supports options to build classes that are compatible with older runtime versions.

Hello, I'm trying to use this patch without success. I've installed Java, but when I'm trying to connect to a videoprojector nothing ...

you can compile it in max, just send message viewsource to mxj object, and from there it is simple to proceed. If you are into reading ...

My goal: running Processing.org (version 3.5.4) from within Max 8 through writing an mxj external on Windows 10, 64 .

in my recherche about mxj I found this post and supposed from it that it is not possible to run an actual java version with mxj.

Hello can anybody tell me which Java package shall I download on my Macbook pro (M1 OS 12.2 Monterey) to run max8? (not for developer).

Hi, could you please let me know the actual version of Java which is supported to write mxj externals. Best wishes C