How to Specify a `java.lang.system` Property

Some aspects of JSSE may be customized by setting system properties. You can set a system property either statically or dynamically:

To set a system property statically, use the -D option of the java command. For example, to run an application named MyApp and set the javax.net.ssl.trustStore system property to specify a truststore named MyCacertsFile , type the following:
```
java -Djavax.net.ssl.trustStore=MyCacertsFile MyApp
```
To set a system property dynamically, call the java.lang.System.setProperty method in your code substituting the appropriate property name and value:
```
System.setProperty(propertyName,"propertyValue");
```
For example, a setProperty call corresponding to the previous example for setting the javax.net.ssl.trustStore system property to specify a truststore named MyCacertsFile would be:
```
System.setProperty("javax.net.ssl.trustStore","MyCacertsFile");
```

In the Java™ Deployment environment (Plug-In/Web Start), there are several ways to set the system properties. For more information, see Java Platform, Standard Edition Deployment Guide.

Use the Java Control Panel to set the Runtime Environment Property on a local or per-VM basis. This creates a local deployment.properties file. Deployers can also distribute an enterprise wide deployment.properties file by using the deployment.config mechanism. For more information, see Deployment Configuration File and Properties.
To set a property for a specific applet, use the HTML subtag <PARAM> "java_arguments" within the <APPLET> tag. For more information, see the Command-line Arguments section of the Java Platform, Standard Edition Deployment Guide.
To set the property in a specific Java Web Start application or applet using Plugin2, use the JNLP property sub-element of the resources element. For more information, see resources Element.

How to Specify a java.lang.system Property