[jboss-dev-forums] [Design the new POJO MicroContainer] - Re: Context installation causes StackOverflowError

[jaikiran]

To show the state change, i changed the number of POJOs being installed to a small number (=3) and added some loggers in the POJOs:

SimplePOJO

public void start() throws Throwable
  |    {
  |       logger.info("Start of " + this);
  |       BeanMetaDataBuilder bmdb = BeanMetaDataBuilder.createBuilder("StringDummy"  + this, String.class.getName());
  | 
  |       // Set access mode
  |       bmdb.setAccessMode(BeanAccessMode.ALL);
  |       logger.info(this + " is now going to install a String");
  |      this.kernel.getController().install(bmdb.getBeanMetaData(), new String("dummy"));
  |      logger.info(this + " successfully installed the String");
  |    }
  | 
  | 

OtherPOJO

  | public void start() throws Throwable
  |    {
  |       logger.info("Start of " + this);
  | 
  |       BeanMetaDataBuilder bmdb = BeanMetaDataBuilder.createBuilder("OtherDummy"  + this, String.class.getName());
  | 
  |       // Set access mode
  |       bmdb.setAccessMode(BeanAccessMode.ALL);
  |       logger.info(this + " is going to install a String");
  |       this.kernel.getController().install(bmdb.getBeanMetaData(), new String("otherdummy"));
  |       logger.info(this + " successfully installed the string");
  |    }
  | 
  | 
  | And here's the output:

  | Line 1 -  [SimplePOJO] Start of SimplePOJO1
  | Line 2 -  [SimplePOJO] SimplePOJO1 is now going to install a String
  | Line 3 -  [SimplePOJO] Start of SimplePOJO2
  | Line 4 -  [SimplePOJO] SimplePOJO2 is now going to install a String
  | Line 5 -  [OtherPOJO] Start of OtherPOJO
  | Line 6 -  [OtherPOJO] OtherPOJO is going to install a String
  | Line 7 -  [OtherPOJO] OtherPOJO successfully installed the string
  | Line 8 -  [SimplePOJO] SimplePOJO2 successfully installed the String
  | Line 9 -  [SimplePOJO] SimplePOJO1 successfully installed the String
  | 
As can be seen, after Line 2 (the point where SimplePOJO1 tries to install a String), Line 3 shows that the start of (an unrelated context) SimplePOJO2 is invoked. The SimplePOJO2 will then try to install another string but that internally triggers a state change on (another unrelated context) OtherPOJO and so on...

On Line 3 i would have expected the output that you are seeing on Line 9. i.e. the install of the String happens and returns immidiately without any state changes to other (unrelated) contexts.


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