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NAME
jre - Java runtime interpreter
SYNOPSIS
jre [ -classpath path(s) ] [ -cp path(s) ]
[ -DpropertyName=newValue ] [ -help ] [ -mxx ] [ -msx ]
[ -noasyncgc ] [ -noclassgc ] [ -nojit ] [ -noverify ]
[ -ossx ] [ -ssx ] [ -v | -verbose ] [ -verbosegc ]
[ -verify ] [ -verifyremote ] classname < args >
DESCRIPTION
The jre command executes Java class files. The classname
argument is the name of the class to be executed. Any argu-
ments to be passed to the class must be placed after the
classname on the command line.
OPTIONS
The following options are supported:
-classpath path(s)
Specifies the path or paths that jre uses to
look up classes. Overrides the default or
the CLASSPATH environment variable if it is
set. If more than one path is specified, they
must be separated by colons. Each path should
end with the directory containing the class
files to be executed. However, if a file to
be executed is a zip or jar(1) file, the path
to that file must end with the file's name.
Here is an example of an argument for
-classpath that specifies three paths con-
sisting of the current directory and two
additional paths:
.:/home/xyz/classes:/usr/local/java/classes/MyClasses.jar
-cp path(s) Prepends the specified path or paths to the
base classpath or path given by the CLASSPATH
environment variable. If more than one path
is specified, they must be separated by
colons. Each path should end with the direc-
tory containing the class file(s) to be exe-
cuted. However, if a file to be executed is a
zip or jar(1) file, the path to that file
must end with the file's name. Here is an
example of an argument for -cp that specifies
three paths consisting of the current direc-
tory and two additional paths:
.:/home/xyz/classes:/usr/local/java/classes/MyClasses.jar
-DpropertyName=newValue
Defines a property value. propertyName is the
name of the property whose value you want to
change and newValue is the value to change it
to. For example, this command line
example% jre -Dawt.button.color=green
...
sets the value of the property
awt.button.color to "green". jre accepts any
number of -D options on the command line.
-help Prints a usage message.
-msx Sets the startup size of the memory alloca-
tion pool (the garbage collection heap) to x.
The default is 16 megabytes of memory. The x
value must be greater than or equal to 1000
bytes.
By default, x is measured in bytes. You can
specify x in either kilobytes or megabytes by
appending "k" for kilobytes or "m" for mega-
bytes.
-mxx Sets the maximum size of the memory alloca-
tion pool (the garbage collection heap) to x.
The default is 1 megabyte of memory. The x
value must be > 1000 bytes.
By default, x is measured in bytes. You can
specify x in either kilobytes or megabytes by
appending "k" for kilobytes or "m" for mega-
bytes.
-noasyncgc Turns off asynchronous garbage collection.
When activated, no garbage collection takes
place unless it is explicitly called or the
program runs out of memory. Normally garbage
collection runs as an asynchronous thread in
parallel with other threads.
-noclassgc Turns off garbage collection of Java classes.
By default, the Java interpreter reclaims
space for unused Java classes during garbage
collection.
-nojit Specifies that any JIT compiler should be
ignored and invokes the default Java inter-
preter.
-noverify Turns verification off.
-ossx Each Java thread has two stacks: one for Java
code and one for C code. The -oss option sets
the maximum stack size that can be used by
Java code in a thread to x. Every thread
that is spawned during the execution of the
program passed to jre has x as its Java stack
size. The default units for x are bytes. The
value of x must be greater than or equal to
1000 bytes.
You can modify the meaning of x by appending
either the letter "k" for kilobytes or the
letter "m" for megabytes. The default stack
size is 400 kilobytes (-oss400k).
-ssx Each Java thread has two stacks: one for Java
code and one for C code. The -ss option sets
the maximum stack size that can be used by C
code in a thread to x. Every thread spawned
during the execution of the program passed to
jre has x as its C stack size. The default
units for x are bytes. The value of x must be
greater than or equal to 1000 bytes.
You can modify the meaning of x by appending
either the letter "k" for kilobytes or "m"
for megabytes. The default stack size is 128
kilobytes (-ss128k).
-v | -verbose Prints a message to stdout each time a class
file is loaded.
-verbosegc Causes the garbage collector to print out
messages whenever it frees memory.
-verify Performs byte-code verification on the class
file. Please note that however, that
example% jre -verify
does not perform a full verification in all
situations. Any code path that is not actu-
ally executed by the interpreter is not veri-
fied and therefore cannot be relied upon to
certify class files unless all code paths in
the class file are actually run.
-verifyremote Runs the verifier on all code that is loaded
into the system using a classloader. This is
the default for the interpreter.
ENVIRONMENT VARIABLES
CLASSPATH Use the CLASSPATH environment variable to
specify the path to the class file or files
that you want to execute. CLASSPATH consists
of a colon-separated list of directories that
contain the class files to be executed. For
example:
.:/home/xyz/classes
If the file to be executed is a zip file or a
jar(1) file, the path should end with the
file name. For example:
.:/usr/local/java/classes/MyClasses.jar
ATTRIBUTES
See attributes(5) for a description of the following attri-
butes:
__________________________________
| ATTRIBUTE TYPE| ATTRIBUTE VALUE|
|_______________|__________________|_
| Availability | SUNWjvrt |
|_______________|_________________|
SEE ALSO
jar(1), attributes(5)
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