Details
Major Description
I received the following problem report:
Having failures running with our VM that is a subset of Java 5. Failure is with the handling of the BigDecimal class in the org.apache.derby.iapi.types.SQLDecimal class.
The SQLDecimal class does reflection to determine if the methods toPlainString and bdPrecison are present or not
private static final Method toPlainString;
private static final Method bdPrecision;
static {
Method m;
try
catch (NoSuchMethodException e)
{ m = null; }toPlainString = m;
try { m = BigDecimal.class.getMethod("precision", null); } catch (NoSuchMethodException e) { m = null; }
bdPrecision = m;
}
however, when it comes time to use them, it does not check whether it found the methods, but rather the JVM level, equating JVM specification level with method existence
public String getString()
{
BigDecimal localValue = getBigDecimal();
if (localValue == null)
return null;
else if (JVMInfo.JDK_ID < JVMInfo.J2SE_15)
return localValue.toString();
else
{
// use reflection so we can still compile using JDK1.4
// if we are prepared to require 1.5 to compile then this can be a direct call
try
catch (IllegalAccessException e) {
and
private static int getWholeDigits(BigDecimal decimalValue)
{
/**
- if ONE > abs(value) then the number of whole digits is 0
*/
decimalValue = decimalValue.abs();
if (ONE.compareTo(decimalValue) == 1) { return 0; }
if (JVMInfo.JDK_ID >= JVMInfo.J2SE_15)
{
// use reflection so we can still compile using JDK1.4
// if we are prepared to require 1.5 to compile then this can be a
// direct call
try {
// precision is the number of digits in the unscaled value,
// subtracting the scale (positive or negative) will give the
// number of whole digits.
int precision = ((Integer) bdPrecision.invoke(decimalValue,
null)).intValue();
return precision - decimalValue.scale();
Since the JVM is claiming 1.5 specification, the code assumes the methods exist, and result in NullPointerExceptions at the low level Derby class, resulting in SQLExceptions thrown to the caller.
>>>> ***Created table: dish
***Created table: VNMEDICALRECORD
Fail to make the query to database:
java.lang.NullPointerException
at org.apache.derby.iapi.types.SQLDecimal.getString(Unknown Source)
at org.apache.derby.iapi.types.DataType.getTraceString(Unknown Source)
at org.apache.derby.impl.sql.GenericParameter.toString(Unknown Source)
at org.apache.derby.impl.sql.GenericParameterValueSet.toString(Unknown Source)
at org.apache.derby.impl.sql.conn.GenericStatementContext.appendErrorInfo(Unknown Source)
at org.apache.derby.iapi.services.context.ContextManager.cleanupOnError(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement.execute(Unknown Source)
at com.ibm.rcp.samples.derby.Derby.updateDB(Derby.java:175)
at com.ibm.rcp.samples.derby.Derby.run(Derby.java:89)
at java.lang.Thread.run(Unknown Source)
Fail to close:
java.sql.SQLException: Cannot issue rollback in a nested connection when there is a pending operation in the parent connection.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.close(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.close(Unknown Source)
at com.ibm.rcp.samples.derby.Derby.updateDB(Derby.java:258)
at com.ibm.rcp.samples.derby.Derby.run(Derby.java:89)
at java.lang.Thread.run(Unknown Source)
Caused by: ERROR X0Y67: Cannot issue rollback in a nested connection when there is a pending operation in the parent connection.
at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.doRollback(Unknown Source)
at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.userRollback(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.rollback(Unknown Source)
... 5 more
Making the following change would fix the problem of running on our VM
Instead of this test
if (JVMInfo.JDK_ID >= JVMInfo.J2SE_15)
test if (toPlainString == null), or if (bdPrecision == null) or equivalent, this should achieved the same results