Java System Properties
Quick Reference Guide Java System Property

The java system property enables debugging output for JSSE

Default Value

Empty - By default debug logging is not enabled

Overview of

The system property enables debug logging for Java Secure Socket Extension or JSSE connections make by java applications using the SunJSSE provider. This includes connections made using the SSL or TLS protocols such as HTTPS connections.

The debugging output produced by the property is not logged to a file. Instead the output is printed to System.out.

Usage Examples

You can combine multiple values in a comma separated list or colon separated list.,handshake,data,keymanager

The above will output (to System.out) SSL/TLS handshake hex dumps, and keymanager tracing information.

Possible Values


Related System Properties

Here are some other networking Java system properties:

Supported Since

Java has supported the system property since at least version 1.8, support may go back to even older versions of java.

Setting on Startup

You can set the java system property during startup of the java runtime using the -D command line argument:

java MyAppMain

You may also be able to specify via the JAVA_TOOL_OPTIONS environment variable:

Setting / Reading at Runtime

You can set at runtime with the following Java code:

System.setProperty("", "all");

WARNING: Depending on the property and JVM version using setProperty may or may not work if the JDK Java class that uses this variable has already been loaded. The value of the system property may be cached within an internal private static variable of the implementing class.

To read the value of at runtime, you can use this Java code:

String propertyValue = System.getProperty("");
if (propertyValue != null) {
    System.out.println(" = " + propertyValue);
} else {
    System.out.println(" was null");