Null Pointer when populating Grails Domain object with Oracle 10g long field

Question

We are trying to populate a domain object from an oracle 10g database. The field in question is defined as a string in the domain object with the following constraints.

zdata(blank:false,maxSize:3000000)

The size of the data is approximately 70K of XML.

The table definition looks like this:

ZDATA NOT NULL LONG()

We are using the grails generated getter to access the table:

reportData = ReportData.get(reportDataId)

When making this call we are getting a null pointer exception. Here is a portion of our stack trace. java.lang.NullPointerException at java.lang.String.(String.java:176) at oracle.sql.CharacterSet.AL32UTF8ToString(CharacterSet.java:1518) at oracle.jdbc.driver.DBConversion.CharBytesToString(DBConversion.java:610) at oracle.jdbc.driver.DBConversion.CharBytesToString(DBConversion.java:555) at oracle.jdbc.driver.LongAccessor.getString(LongAccessor.java:217) at oracle.jdbc.driver.T4CLongAccessor.getString(T4CLongAccessor.java:426) at oracle.jdbc.driver.OracleResultSetImpl.getString(OracleResultSetImpl.java:403) at oracle.jdbc.driver.OracleResultSet.getString(OracleResultSet.java:1515) at org.apache.commons.dbcp.DelegatingResultSet.getString(DelegatingResultSet.java:224) at org.hibernate.type.StringType.get(StringType.java:18) at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:163) at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:154) at org.hibernate.loader.hql.QueryLoader.getResultColumnOrRow(QueryLoader.java:333) at org.hibernate.loader.Loader.getRowFromResu ltSet(Loader.java:606) at org.hibernate.loader.Loader.doQuery(Loader.java:701) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236) at org.hibernate.loader.Loader.doList(Loader.java:2220) at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104) at org.hibernate.loader.Loader.list(Loader.java:2099) at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378) at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338) at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172) at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121) at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79) at org.codehaus.groovy.grails.orm.hibernate.metaclass.ExecuteQueryPersistentMethod$1.doInHibernate(ExecuteQueryPersistentMethod.java:94)

we are using oracle driver 10.2.0.3.0.

Answer 1

This is a known limitation of the oracle jdbc driver as listed in the release notes for version 10.2.0.1.0.

This known limitation has been fixed according to the release notes of Oracle JDBC Driver release 11.1.0.7.0

Answer 2

Why do you use a long field in Oracle? Long is very obsolete, you should use a clob.

Answer 3

如果要在Oracle中存储XML，请使用XmlType列，该列可以轻松转换为CLOB，并且可以与JDBC 10g驱动程序完美地配合使用，因为这是我们当前在生产环境中使用的。