Thread: StringBuilder.append( double ) throws ArrayIndexOutOfBoundsException

Hi,

I got an exception report from a client. In this report StringBuilder.append( double ) throws an ArrayIndexOutOfBoundsException.

There is no thread issue involved, because that code simply looks as follows:

  StringBuilder sb = new StringBuilder( "" );		
  sb.append( degrees ); // This is the line that throws an exception (degrees is of type double)

The stack trace of the exception is:

	at java.lang.RealToString.longDigitGenerator(RealToString.java:274)
	at java.lang.RealToString.convertDouble(RealToString.java:111)
	at java.lang.RealToString.appendDouble(RealToString.java:63)
	at java.lang.StringBuilder.append(StringBuilder.java:185)
	at my code

The code runs on an Android telephone LG-C660h.
Android version: 2.3.4
Android API: 10

Any ideas?

Thanks in advance.

Any idea what the value of degrees is when this exception is thrown? Could it be one of double's edge values: Double.NaN, Double.NEGATIVE_INFINITY, Double.POSITIVE_INFINITY?

I don't know, but I don't think this is very likely. I got this from an automatic report sent from a client device, so I don't have the value.

Following your question, I tried the code below on my Samsung S II, and it produced no exception:

		StringBuilder sb1 = new StringBuilder( "" );
		sb1.append( Double.MAX_VALUE );
 
		StringBuilder sb2 = new StringBuilder( "" );
		sb2.append( Double.MIN_VALUE );
 
		StringBuilder sb3 = new StringBuilder( "" );
		sb3.append( Double.NaN );
 
		StringBuilder sb4 = new StringBuilder( "" );
		sb4.append( Double.NEGATIVE_INFINITY );
 
		StringBuilder sb5 = new StringBuilder( "" );
		sb5.append( Double.POSITIVE_INFINITY );