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From Jérôme Baumgarten <jbaumgar...@gmail.com>
Subject Re: [jira] Commented: (DIRSNICKERS-106) DERGeneralizedTime and DERUTCTime are not thread safe
Date Thu, 01 Sep 2005 11:50:46 GMT
Actually it is the same for java.text.Format and all subclasses.

I also discovered that lately and had to go through all my code to
take care of that.

On 9/1/05, Emmanuel Lecharny (JIRA) <directory-dev@incubator.apache.org> wrote:
>     [ http://issues.apache.org/jira/browse/DIRSNICKERS-106?page=comments#action_12320775
]
> 
> Emmanuel Lecharny commented on DIRSNICKERS-106:
> -----------------------------------------------
> 
> Bloody sh*t ! That's a good catch !
> 
> SimpleDateFormat has been documented as not thread safe only in jdk1.4 doco.
> 
> It uses a Calendar internally, which is not threadsafe.
> 
> We must browse the whole code to find out every places where SimpleDateFormat is used
as a static member.
> 
> Thanks Tomi !
> 
> > DERGeneralizedTime and DERUTCTime are not  thread safe
> > ------------------------------------------------------
> >
> >          Key: DIRSNICKERS-106
> >          URL: http://issues.apache.org/jira/browse/DIRSNICKERS-106
> >      Project: Directory ASN1
> >         Type: Bug
> >   Components: BER Runtime
> >     Versions: 0.3.0
> >  Environment: Java version "1.5.0_04", Windows XP.
> >     Reporter: Tomi Keinonen
> >     Assignee: Alex Karasulu
> 
> >
> > Both classes DERGeneralizedTime and DERUTCTime include a static definition for date
format:
> >  private static final SimpleDateFormat dateFormat = new SimpleDateFormat( "yyMMddHHmmss'Z'"
);
> > Static attribute is used by method:
> >     public Date getDate()
> >       throws ParseException
> >     {
> >         String string = byteArrayToString( value );
> >         return dateFormat.parse( string );
> >     }
> > This fails when multiple threads access getDate concurrently. Calling dateFormat.parse
is not synchronized and class SimpleDateFormat is not  internally syncronized. JavaDoc for
SimpleDateFormat says:
> > "Date formats are not synchronized. It is recommended to create separate format
instances for each thread. If multiple threads access a format concurrently, it must be synchronized
externally."
> > This causes not to be able to parse multiple DER streams concurrently and limits
their usage in server environment.
> > Without synchronization dateFormat.parse causes unpredictable errors. For example:
> > ---
> >  java.lang.NumberFormatException: For input string: ".1212"
> >       at java.lang.NumberFormatException.forInputString(Unknown Source)
> >       at java.lang.Long.parseLong(Unknown Source)
> >       at java.lang.Long.parseLong(Unknown Source)
> >       at java.text.DigitList.getLong(Unknown Source)
> >       at java.text.DecimalFormat.parse(Unknown Source)
> >       at java.text.SimpleDateFormat.subParse(Unknown Source)
> >       at java.text.SimpleDateFormat.parse(Unknown Source)
> >       at java.text.DateFormat.parse(Unknown Source)
> >       at org.apache.asn1.der.DERGeneralizedTime.getDate(DERGeneralizedTime.java:68)
> > ---
> > java.lang.NumberFormatException: For input string: ""
> >       at java.lang.NumberFormatException.forInputString(Unknown Source)
> >       at java.lang.Long.parseLong(Unknown Source)
> >       at java.lang.Long.parseLong(Unknown Source)
> >       at java.text.DigitList.getLong(Unknown Source)
> >       at java.text.DecimalFormat.parse(Unknown Source)
> >       at java.text.SimpleDateFormat.subParse(Unknown Source)
> >       at java.text.SimpleDateFormat.parse(Unknown Source)
> >       at java.text.DateFormat.parse(Unknown Source)
> >       at org.apache.asn1.der.DERGeneralizedTime.getDate(DERGeneralizedTime.java:68)
> > ---
> > java.lang.ArrayIndexOutOfBoundsException: -1
> >       at java.text.DigitList.fitsIntoLong(Unknown Source)
> >       at java.text.DecimalFormat.parse(Unknown Source)
> >       at java.text.SimpleDateFormat.subParse(Unknown Source)
> >       at java.text.SimpleDateFormat.parse(Unknown Source)
> >       at java.text.DateFormat.parse(Unknown Source)
> >       at org.apache.asn1.der.DERGeneralizedTime.getDate(DERGeneralizedTime.java:68)
> > ---
> 
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