Minimal Activiti engine for use on Android

hybridmojo — Wed, 01 Feb 2012 17:48:49 GMT

Hi folks,I wanted to get an idea of the size and components that would make up a minimal project using Activiti so I can try to deploy it on Android. I tried using jBoss jBpm but unfortunately to do even basic tasks like loading a bpmn file, jBpm has rather extensive dependencies on drools. Drools

Re: Minimal Activiti engine for use on Android

jbarrez — Thu, 02 Feb 2012 11:27:18 GMT

What kind of functionality would you need from Activiti?
Do note that a jdbc database is required for Activiti, I don't know how that will work on Android.

Re: Minimal Activiti engine for use on Android

hybridmojo — Thu, 02 Feb 2012 21:21:42 GMT

JBarrez,

Android has a SQLLite DB built in, but this lacks a JDBC driver. Darn.

Looks like I'll have to do it server side.

Re: Minimal Activiti engine for use on Android

hybridmojo — Fri, 03 Feb 2012 02:30:57 GMT

Actually, there is a partial implementation available.

http://groups.google.com/group/android-developers/browse_thread/thread/cf3dea94d2f6243c

Re: Minimal Activiti engine for use on Android

jbarrez — Fri, 03 Feb 2012 08:53:36 GMT

Cool (from a tech point of view ;-)!

Re: Minimal Activiti engine for use on Android

hybridmojo — Fri, 03 Feb 2012 19:01:51 GMT

So I tried creating a basic project and adding the activiti engine libs plus sqldroid.

// Register SQLite JDBC driver
Class.forName("org.sqldroid.SQLDroidDriver").newInstance();

// Get process engine
ProcessEngines.init(); 
        
// Load cfg file
InputStream cfg_is;
cfg_is = getResources().getAssets().open("activiti.cfg.xml");

// Use cfg file to create a process engine
ProcessEngine processEngine = ProcessEngineConfiguration.createProcessEngineConfigurationFromInputStream(cfg_is).buildProcessEngine();

RuntimeService runtimeService = processEngine.getRuntimeService();
     
Map<String,Object> variables = new HashMap<String,Object>();
variables.put("test", "test");
     
// may need to deploy 
runtimeService.startProcessInstanceByKey("setScriptResultToProcessVariable", variables);  
     
// Shut down
ProcessEngines.destroy();

Well the code gets to processEngine.getRuntimeService(); and then barfs with an unhelfpul Android error.

The useful bit of the stacktrace is:
org.springframework.beans.factory.BeanDefinitionStoreException: Parser configuration exception parsing XML from resource loaded through InputStream; nested exception is javax.xml.parsers.ParserConfigurationException: Unable to validate using XSD: Your JAXP provider [org.apache.harmony.xml.parsers.DocumentBuilderFactoryImpl@4057c940] does not support XML Schema. Are you running on Java 1.4 with Apache Crimson? Upgrade to Apache Xerces (or Java 1.5) for full XSD support.

I assume the XML Schema is being used for validation, is there a way to turn this off?

Full stack trace follows:

02-02 19:38:44.976: E/AndroidRuntime(27945): FATAL EXCEPTION: main
02-02 19:38:44.976: E/AndroidRuntime(27945): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hybridmojo.sample.activi/com.hybridmojo.sample.activi.ActivitiSampleActivity}: org.springframework.beans.factory.BeanDefinitionStoreException: Parser configuration exception parsing XML from resource loaded through InputStream; nested exception is javax.xml.parsers.ParserConfigurationException: Unable to validate using XSD: Your JAXP provider [org.apache.harmony.xml.parsers.DocumentBuilderFactoryImpl@4057c940] does not support XML Schema. Are you running on Java 1.4 with Apache Crimson? Upgrade to Apache Xerces (or Java 1.5) for full XSD support.
02-02 19:38:44.976: E/AndroidRuntime(27945):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1821)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1842)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at android.app.ActivityThread.access$1500(ActivityThread.java:132)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at android.os.Handler.dispatchMessage(Handler.java:99)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at android.os.Looper.loop(Looper.java:143)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at android.app.ActivityThread.main(ActivityThread.java:4263)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at java.lang.reflect.Method.invokeNative(Native Method)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at java.lang.reflect.Method.invoke(Method.java:507)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at dalvik.system.NativeStart.main(Native Method)
02-02 19:38:44.976: E/AndroidRuntime(27945): Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Parser configuration exception parsing XML from resource loaded through InputStream; nested exception is javax.xml.parsers.ParserConfigurationException: Unable to validate using XSD: Your JAXP provider [org.apache.harmony.xml.parsers.DocumentBuilderFactoryImpl@4057c940] does not support XML Schema. Are you running on Java 1.4 with Apache Crimson? Upgrade to Apache Xerces (or Java 1.5) for full XSD support.
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:404)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.activiti.engine.impl.cfg.BeansConfigurationHelper.parseProcessEngineConfiguration(BeansConfigurationHelper.java:35)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.activiti.engine.impl.cfg.BeansConfigurationHelper.parseProcessEngineConfigurationFromInputStream(BeansConfigurationHelper.java:43)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.activiti.engine.ProcessEngineConfiguration.createProcessEngineConfigurationFromInputStream(ProcessEngineConfiguration.java:163)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.activiti.engine.ProcessEngineConfiguration.createProcessEngineConfigurationFromInputStream(ProcessEngineConfiguration.java:159)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at com.hybridmojo.sample.activi.ActivitiSampleActivity.onCreate(ActivitiSampleActivity.java:50)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1785)
02-02 19:38:44.976: E/AndroidRuntime(27945):  … 11 more
02-02 19:38:44.976: E/AndroidRuntime(27945): Caused by: javax.xml.parsers.ParserConfigurationException: Unable to validate using XSD: Your JAXP provider [org.apache.harmony.xml.parsers.DocumentBuilderFactoryImpl@4057c940] does not support XML Schema. Are you running on Java 1.4 with Apache Crimson? Upgrade to Apache Xerces (or Java 1.5) for full XSD support.
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.springframework.beans.factory.xml.DefaultDocumentLoader.createDocumentBuilderFactory(DefaultDocumentLoader.java:102)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:70)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:388)
02-02 19:38:44.976: E/AndroidRuntime(27945):  … 20 more
02-02 19:38:44.976: E/AndroidRuntime(27945): Caused by: java.lang.IllegalArgumentException: http://java.sun.com/xml/jaxp/properties/schemaLanguage
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.apache.harmony.xml.parsers.DocumentBuilderFactoryImpl.setAttribute(DocumentBuilderFactoryImpl.java:86)
02-02 19:38:44.976: E/AndroidRuntime(27945):  at org.springframework.beans.factory.xml.DefaultDocumentLoader.createDocumentBuilderFactory(Def

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