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Editorial Team
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Asked: 2026-05-17T16:20:14+00:00

I created a class String and placed that in package java [ actually i

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I created a class “String” and placed that in package “java” [ actually i wanted to create java.lang to see which class is loaded by classLoader as

Once a class is loaded into a JVM, the
same class (I repeat, the same class)
will not be loaded again

quoted from oreilly ] . But that thing later, why on running this class i am getting
java.lang.SecurityException: Prohibited package name: java

For which security reason java is not allowing me to have a class in java package? What one could do if there will not be no such check?

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1 Answer

  1. Editorial Team

    User code is never allowed to put classes into one of the standard Java packages. That way, user code cannot access any package-private classes/methods/fields in the Java implementation. Some of those package-private objects allow access to JVM internals. (I’m thinking of SharedSecrets in particular.)

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