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java -Djava.security.manager=my.security.ManagerCustomManager ... |
Invocation of the setSecurityManager() method may be omitted in controlled environments where it is known that a default global security manager is always installed from the command line; this is not a typical case. In this case, attempts to invoke setSecurityManager() will throw a SecurityException if the current security policy enforced by the global security manager forbids replacements (by omitting the RuntimePermission("setSecurityManager")).
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