You can for example download the Solaris 10 media or you can download the package directly from the java.oracle.com website.
You can use the official Java archives available at:
Please note that from here you'll be able to download the native packages for JRE/JDK of Java 1.6.0_45.
If your support contract also covers Java, then you'll be entitled to download the latest patches for Java 1.6.0_81 :
125136-81 - Java SE 6 JDK & JRE Solaris SPARC 32-bit
125137-81 - Java SE 6 JDK & JRE Solaris SPARC 64-bit
125138-81 - Java SE 6 JDK & JRE Solaris x86_64 32-bit
125139-81 - Java SE 6 JDK & JRE Solaris x86_64 64-bit