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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3813) Derby tests for the existance of BigDecimal methods toPlainString and bdPrecison but does not check if they were found before using them.
Date Fri, 08 Aug 2008 15:57:44 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620964#action_12620964
] 

Daniel John Debrunner commented on DERBY-3813:
----------------------------------------------

The issue is that the format of the value issued by toString() changed from Java 1.4 to 1.5,
an unusual incompatibility introduced into java.

Thus the code to determine precision from toString() works in 1.4 but will not work in 1.5,
would have to use toPlainString() instead, but since 1.5 introduced a precision() method it
makes most sense to use that in 1.5.

> Derby tests for the existance of BigDecimal methods toPlainString and bdPrecison but
does not check if they were found before using them.
> -----------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3813
>                 URL: https://issues.apache.org/jira/browse/DERBY-3813
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions: 10.3.3.0
>         Environment: Using a VM that is a subset of Java 5 without full BigDecimal support
>            Reporter: Stan Bradbury
>            Assignee: Kathey Marsden
>             Fix For: 10.3.3.1, 10.4.2.0, 10.5.0.0
>
>         Attachments: DERBY-3813_diff.txt
>
>
> 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 {
>             m = BigDecimal.class.getMethod("toPlainString", null);
>         } 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 {
>                 return (String) toPlainString.invoke(localValue, null);
>             } 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
> 	

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