java/5913: Core dump for String constant instanceof
Sun Mar 10 18:26:00 GMT 2002

>Number:         5913
>Category:       java
>Synopsis:       Core dump for String constant instanceof
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 10 18:26:00 PST 2002
>Originator:     Eric Blake
>Release:        3.1 20020309 (prerelease)
System: Linux quaffle 2.4.9-13smp #1 SMP Tue Oct 30 19:57:16 EST 2001 i686 unknown
Architecture: i686

host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc/configure --enable-threads=posix --prefix=/fpga3/users/eblake/gcc --enable-shared
I encountered this while patching bug 5902. This program is legal, and
should print "true". Remember, + has higher precedence than
instanceof, and ""+1 is a constant with the value "1". A string
literal is always an instanceof String.

class Foo {
  public static void main(String[] args) {
    System.out.println((""+1) instanceof String);

bash-2.05$ gcj --main=Foo -o Foo In class `Foo': In method `Foo.main(java.lang.String[])': internal error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:> for instructions.

	<precise description of the problem (multiple lines)>

More information about the Java-prs mailing list