Why am I getting package javax.crypto does not exist

Question

When I compile a class using javax.crypto.Mac I get this error message?

package javax.crypto does not exist

I can fix it by including jre/lib/jce.jar in my compile classpath.

Why is jce.jar not on the default jdk classpath? jre/lib/rt.jar is on the classpath, and includes other javax packages, but jce seems special?

Prurigo

Just to mention, jre/lib path should be in your path anyways. If that was not included then you have not setup java properly on your machine. – Losel

I used the oracle installer. My version information is java version "1.7.0_10" Java(TM) SE Runtime Environment (build 1.7.0_10-b18) Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode) – Prurigo

my colleague has exactly the same problem with openjdk on ubuntu. – Prurigo

Your title doesn't agree with your question. – Net

My apologies. I was compiling with an inherited Ant file, and I did not notice that that the javac task had this specified: bootclasspath="${java.home}/lib/rt.jar". I will answer the question (as a mistake :) ) – Prurigo

Answer 1

OK, this was a mistake on my part. The Ant file I was using to compile the code had this attribute on the javac task:

bootclasspath="${java.home}/lib/rt.jar" 

Doh. You can add the JCE jar like this:

bootclasspath="${java.home}/lib/rt.jar:${java.home}/lib/jce.jar"

Prurigo

Answer 2

Beware! This class is only included in the jdk from oracle. That means your program won;t be portable among different jdk (eg openjdk) It is preferable to use this lib externally, it can be downloaded from here

Jessie

Answer 3

It worked for me, I downloaded the zip and paste these 3 files into C:\Program Files\Java\jdk1.7.0_11\jre\lib\ext as explained in jce-1_2_2/jce1.2.2/INSTALL.html in the zip file.

• jce1_2_2.jar
• US_export_policy.jar
• local_policy.jar

Krebs

You should put the full link for the install page. – Timely