Licensing the AS Java
Once the AS java has been installed, you can log on, since a temporary license has automatically been installed.
You then have to request and install a permanent license from SAP.
There are two types of SAP licenses: permanent and temporary licenses.
· Permanent License
How you go about getting a permanent license from SAP is explained in Requesting and Installing an SAP License.
· Temporary License
If a temporary license was generated during installation, this has a validity period of 90 days.

Note that you cannot install another temporary license, if the expired license is also a temporary license. If you again install a temporary license at a later time, this has a validity period of 28 days.
If your permanent license has expired, as a short term measure you can install a temporary license.
To do this, in the SAP NetWeaver Administratorchoose Configuration Management → Infrastructure → Licenses → Available Licenses → Extend Temporary.
You should have installed a permanent license again by the time the temporary license expires.