Hi, Hibernate experts,
I came across a strange problem in hibernate2.0.2.
I have a java object Client with serveral properties.
The mapping is as follow(I omit the java source before I think there's little chance
of mapping error since the error occurred at Session flush phrase):
<class
name="com.erry.model.baseinfo.Client"
table="T_BI_CLIENT"
>
<meta attribute="extends">com.erry.framework.persistence.BaseModel</meta>
<id
name="id"
type="java.lang.Long"
column="ID"
unsaved-value="null"
>
<generator class="native"/>
</id>
<property
name="code"
type="java.lang.String"
column="CODE"
length="60"
/>
<property
name="name"
type="java.lang.String"
column="NAME"
length="30"
/>
<property
name="type"
type="int"
column="TYPE"
length="10"
/>
<property
name="customType"
type="java.lang.String"
column="CUSTOM_TYPE"
length="30"
/>
<property
name="maintainstopType"
type="java.lang.String"
column="MAINTAINSTOP_TYPE"
length="30"
/>
<property
name="priceRule"
type="int"
column="PRICE_RULE"
length="10"
/>
<property
name="delayTime"
type="int"
column="DELAY_TIME"
length="10"
/>
<property
name="isFrozen"
type="boolean"
column="IS_FROZEN"
length="10"
/>
<property
name="invoiceAddress"
type="java.lang.String"
column="INVOICE_ADDRESS"
length="255"
/>
<property
name="website"
type="java.lang.String"
column="WEBSITE"
length="30"
/>
<property
name="freightAgent"
type="int"
column="FREIGHT_AGENT"
length="50"
/>
<property
name="airFreightAgent"
type="int"
column="AIR_FREIGHT_AGENT"
length="50"
/>
<property
name="isUsed"
type="boolean"
column="IS_USED"
length="10"
/>
<property
name="isValid"
type="boolean"
column="IS_VALID"
length="10"
/>

<!-- associations -->

</class>

Here's the stacktrace:
testMapCreate(com.erry.model.baseinfo.TestClientHome)java.lang.NullPointerException
at net.sf.hibernate.impl.SessionImpl.flushEntities(SessionImpl.java:2141)
at net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2017)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2004)
at net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:57)
at com.erry.framework.persistence.TransactionManager.commitDatabase(TransactionManager.java:85)
at com.erry.TestBase.tearDown(TestBase.java:45)
at com.erry.model.baseinfo.TestClientHome.tearDown(TestClientHome.java:69)
......
Please give me some suggestion.
Thank you very much!

Justine

Very, very wierd!

Quite bizarre in fact. The exception occurs on this line:




So somehow your object has come to be registered with a null identifier !?

I don't even know how that can happen in the case of a synthetic id.

Well, I assume you must be doing something very wierd with your identifiers, but if thats not the case, then submit a simple test case to JIRA and I'll take a look. I don't have a hope in hell of being able to track this one down w/o a test.

Hi, Gavin
Thank you very much for your response.
After an hour's hunting I have found where the bug lies. :-)
It's basically something about mismatched data type between java class and mapping file. Say, I have so-called property 'airFreightAgent'. It was an int at first but I changed it to String in Java source. However, I forgot to change it in mapping file accordingly. So hibernate is fooled.

So we can make hibernate a little bit more robust by checking data types declared in java source and the one specified in mapping file. And it may make particular sense for beginner like I. :-)

Thank you for this wonderful O/R mapping!

Justine