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