If you are using the Eclipse client and want to checkin the class files in the bin/ folder, then see

http://jazz.net/forums/viewtopic.php?t=8531&highlight=ignore+class

Otherwise, if the class files are in other directories you will have to remove the global .class ignore rule by selecting one of the .class files and select Team > Remove From Ignore List.

.class is in the default list, this should add an .ignorefile at the root of the project without the default global rule for .class files.

### Jazz Ignore 0
# Default value for core.ignore.recursive is *.class
# Changing this value changes check-in behaviour for the entire project.
#
# Default value for core.ignore is bin
# Changing this value changes check-in behaviour for the local directory.
#
# Ignore properties should contain a space separated list of filename patterns.
# Each pattern is case sensitive and surrounded by braces ('{' and '}').
# "*" matches zero or more characters, and "?" matches single characters.
#
# e.g: {*.sh} {\.*} ignores shell scripts and hidden files

# NOTE: modifying ignore files will not change the ignore status of derived
# resources.

core.ignore.recursive=

core.ignore= \
{bin}