# JRuby on Android - getting a VerifyError thrown **URL:** \ **Category:** JRuby\ **Created:** [October 7, 2008, 7:06pm UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361 "2008-10-07T19:06:04Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![noagenda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/8c91f0/32.png) [@noagenda](https://www.ruby-forum.com/u/noagenda)\ **Post date:** [October 7, 2008, 7:06pm UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361/1 "2008-10-07T19:06:04Z")
I’m experimenting with JRuby on Android. Unfortunately, Android doesn’t have java.lang.mangement - is there any way around that? I’m getting a VerifyError thrown when Android’s classloader tries to pull in org.jruby.manager.BeanManager - the exception is thrown at line 209 of Ruby.java (from trunk): ``` this.beanManager = new BeanManager(this, ``` config.isManagementEnabled()); And this from the android log: VFY: unable to resolve static method 1349: Ljava/lang/management/ManagementFactory;.getPlatformMBeanServer ()Ljavax/management/MBeanServer; Using trunk jruby - 1.1.4 doesn’t load in Android. – James M. | removed\_email\_address@domain.invalid Ruby and Ruby on Rails consulting [blog.restphone.com](http://blog.restphone.com) * * * To unsubscribe from this list, please visit: ``` http://xircles.codehaus.org/manage_email ``` ---
**Author:** ![noagenda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/8c91f0/32.png) [@noagenda](https://www.ruby-forum.com/u/noagenda)\ **Post date:** [October 7, 2008, 7:58pm UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361/2 "2008-10-07T19:58:22Z")
Try running with JMX disabled: jruby -J-Djruby.management.enabled=false Or, if you are programatically running JRuby instances, you could try to set this System property yourself. On Tue, Oct 7, 2008 at 2:05 PM, James M. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > And this from the android log: > [blog.restphone.com](http://blog.restphone.com) > > * * * > > To unsubscribe from this list, please visit: > > [http://xircles.codehaus.org/manage\_email](http://xircles.codehaus.org/manage_email) РFabio K. > **[Fabio Kung](https://fabiokung.com/)** > > software, programming, computers, technology Caelum - Ensino e Inova̤̣o [http://www.caelum.com.br](http://www.caelum.com.br) ---
**Author:** ![noagenda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/8c91f0/32.png) [@noagenda](https://www.ruby-forum.com/u/noagenda)\ **Post date:** [October 8, 2008, 12:00am UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361/3 "2008-10-08T00:00:20Z")
Yeah, I’d expect we need a more “servicey” way of loading these things that can fail gracefully if e.h. javax.management isn’t present. And I would wager that’s an approach we’d need in several places to support platforms like Android. Look at how the LazyLoading service thingy (search for “lazy” in Ruby.java") does stuff; something similar for JRuby-level services would probably be appropriate. James M. wrote: > * * * > > To unsubscribe from this list, please visit: > > ``` > http://xircles.codehaus.org/manage_email > > ``` * * * To unsubscribe from this list, please visit: ``` http://xircles.codehaus.org/manage_email ``` ---
**Author:** ![noagenda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/8c91f0/32.png) [@noagenda](https://www.ruby-forum.com/u/noagenda)\ **Post date:** [October 7, 2008, 8:21pm UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361/4 "2008-10-07T20:21:54Z")
Thanks - I’ll give it a shot, but I think I have to change some code, not just the setting. register() and unregister() need to be moved out of BeanManager, since BeanManager itself won’t even load. On Tue, Oct 7, 2008 at 10:57 AM, Fabio K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Try running with JMX disabled: > jruby -J-Djruby.management.enabled=false > Or, if you are programatically running JRuby instances, you could try to set > this System property yourself. * * * To unsubscribe from this list, please visit: ``` http://xircles.codehaus.org/manage_email ``` ---
**Author:** ![noagenda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/8c91f0/32.png) [@noagenda](https://www.ruby-forum.com/u/noagenda)\ **Post date:** [October 9, 2008, 4:54am UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361/5 "2008-10-09T04:54:35Z")
Hey Guys, I’m a rubyist, and java neophyte (but i’ve been following the jvms development for a while). Anyway, i’ve been googling for information regarding android, jruby, and javaMe to try and get a better lay of the land before i figure out how to get into things deeper (i’m a top down sorta guy). I found a blog post by John Rose back from May ( [http://blogs.sun.com/jrose/entry/with\_android\_and\_dalvik\_at](http://blogs.sun.com/jrose/entry/with_android_and_dalvik_at) ) about the dalvik vm ( [Dalvik (software) - Wikipedia](http://en.wikipedia.org/wiki/Dalvik_virtual_machine) ), which makes the following claim: 1. Something like the dx tool can be forced into the phone, so that Java code could in principle continue to generate bytecodes, yet have them be translated into a VM-runnable form. But, at present, Java code cannot be generated on the fly. This means Dalvik cannot run dynamic languages (JRuby, Jython, Groovy). Yet. (Perhaps the dex format needs a detuned variant which can be easily generated from bytecodes.) I don’t have either the contacts or sufficient background to really know what the real implication of this is, or to what degree things have changed internal to android (or could change). Anyone better informed and/or connected, who would want to take a stab at addressing this? -T On Tue, Oct 7, 2008 at 5:59 PM, Charles Oliver N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > this System property yourself. > > * * * > > To unsubscribe from this list, please visit: > > [http://xircles.codehaus.org/manage\_email](http://xircles.codehaus.org/manage_email) * * * To unsubscribe from this list, please visit: ``` http://xircles.codehaus.org/manage_email ``` ---
**Author:** ![noagenda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/8c91f0/32.png) [@noagenda](https://www.ruby-forum.com/u/noagenda)\ **Post date:** [October 10, 2008, 8:04am UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361/6 "2008-10-10T08:04:51Z")
Ted H. wrote: > informed and/or connected, who would want to take a stab at addressing > this? The real implication here is simply that anything in JRuby that depends on generating bytecode would have to be ripped out. This includes: - on-the-fly compilation - on-the-fly method handle (invoker) generation - Java subclassing (and potentially interface impl via …reflect.Proxy) That’s not so bad is it? There’s two possible execution scenarios that would work with these limitations: - Pure interpreted, where all code gets parsed on the device and executed with our AST-walking interpreter logic. This would probably be slower than we’d like, but easy to make work. - Pure compiled, with all invokers/handles generated ahead-of-time as well. Both cases are already possible in the current codebase; the only trick would be producing a deliverable .jar that provides only the one and has no dependencies on the other. - Charlie * * * To unsubscribe from this list, please visit: ``` http://xircles.codehaus.org/manage_email ``` ---
**Author:** ![noagenda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/8c91f0/32.png) [@noagenda](https://www.ruby-forum.com/u/noagenda)\ **Post date:** [November 10, 2008, 11:59pm UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361/7 "2008-11-10T23:59:47Z")
I’m so glad to have found this thread. I’m a professional rubyist too and I’ve been searching for solutions to running dynamic JVM languages on Dalvik, specifically JRuby. (I’m starting an Android Developer’s group in my city, Phoenix, and there’s _lots_ of local interest in Ruby Android development, if it’s possible.) I hope someone posts back if they get something working! I’ll post back, if I do. Does anyone know if there’s any development underway to allow for run-time bytecode generation / compilation and whatnot on Dalvik? If Dalvik were modified to support this (if it’s even possible), I’m certain the memory usage would go up … but, without things like on-the-fly method handling, you lose a _big_ benefit of Ruby: DSL creation. Ruby is an ideal language for creating DSLs for Android development, in my opinion, specifically because of some of its dynamicness. That said … you could still make some pretty nice DSLs with Ruby, without on-the-fly invoker/compilaiton. Anyway, incase it helps anyone … here are some other threads where I’ve been trying to document JRuby+Android, as well as running dynamic JVM languages on Dalvik, in general: “Status of Jython, JRuby, Scala, etc Android development?”: [http://groups.google.com/group/android-beginners/browse\_thread/thread/59350a39960c6b28/8363e867741eba2a](http://groups.google.com/group/android-beginners/browse_thread/thread/59350a39960c6b28/8363e867741eba2a) “Java/Ruby Support”: [http://groups.google.com/group/phoenix-android/browse\_thread/thread/6e254dcdf738f5df](http://groups.google.com/group/phoenix-android/browse_thread/thread/6e254dcdf738f5df) Charles Oliver N. wrote: > Ted H. wrote: > > > informed and/or connected, who would want to take a stab at addressing > > this? > > The real implication here is simply that anything in JRuby that depends > on generating bytecode would have to be ripped out. This includes: > > - on-the-fly compilation > - on-the-fly method handle (invoker) generation > - Java subclassing (and potentially interface impl via …reflect.Proxy) > > That’s not so bad is it? There’s two possible execution scenarios that > would work with these limitations: > > - Pure interpreted, where all code gets parsed on the device and > executed with our AST-walking interpreter logic. This would probably be > slower than we’d like, but easy to make work. > - Pure compiled, with all invokers/handles generated ahead-of-time as > well. > > Both cases are already possible in the current codebase; the only trick > would be producing a deliverable .jar that provides only the one and has > no dependencies on the other. > > - Charlie > > * * * > > To unsubscribe from this list, please visit: > > ``` > http://xircles.codehaus.org/manage_email > > ``` ---
**Author:** ![noagenda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/8c91f0/32.png) [@noagenda](https://www.ruby-forum.com/u/noagenda)\ **Post date:** [November 20, 2008, 7:19pm UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361/8 "2008-11-20T19:19:35Z")
Has anyone actually gotten pure compiled or pure interpreted JRuby working on Android yet? Or, if I wanted to try to get this working, what might I need to do? ---
**Author:** ![noagenda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/8c91f0/32.png) [@noagenda](https://www.ruby-forum.com/u/noagenda)\ **Post date:** [July 26, 2011, 3:26am UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361/9 "2011-07-26T03:26:03Z")
remi Taylor wrote in post #751346: > Has anyone actually gotten pure compiled or pure interpreted JRuby > working on Android yet? Or, if I wanted to try to get this working, > what might I need to do? This is an old thread, but if anyone stumbles into it: Check out [http://ruboto.org/](http://ruboto.org/) That’s a working JRuby on Android! ---
**Author:** ![noagenda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/8c91f0/32.png) [@noagenda](https://www.ruby-forum.com/u/noagenda)\ **Post date:** [July 28, 2011, 2:51am UTC](https://www.ruby-forum.com/t/jruby-on-android-getting-a-verifyerror-thrown/150361/10 "2011-07-28T02:51:56Z")
On Mon, Jul 25, 2011 at 8:26 PM, Uwe K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > That’s a working JRuby on Android! You can also get it for SL4A ( [Google Code Archive - Long-term storage for Google Code Project Hosting.](http://code.google.com/p/android-scripting/) ). I’d be interested if anyone knows the differences between JRuby in the two environments.