Essential Books

Enabling the SecurityManager

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Java Virtual Machines (JVMs) can be run with a SecurityManager installed. The SecurityManager governs what the code running in the JVM is allowed to do, based on factors such as where the code was loaded from and what certificates were used to sign the code.

The SecurityManager can be installed by setting the java.security.manager system property on the command line when starting the JVM:

java -Djava.security.manager <main class name>

or programatically from within Java code:

System.setSecurityManager(new SecurityManager())

The standard Java SecurityManager grants permissions on the basis of a Policy, which is defined in a policy file. If no policy file is specified, the default policy file under $JAVA_HOME/lib/security/java.policy will be used.

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SecurityManager:
* SecurityManager
* Sandboxing classes loaded by a ClassLoader
* Enabling the SecurityManager
* Implementing policy deny rules
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0 Inheritance
1 Getting started with Java
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84 The Classpath
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90 XML XPath Evaluation
91 Performance Tuning
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93 Common Pitfalls
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95 Java Compiler
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98 Process
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103 Just in Time JIT compiler
104 FTP File Transfer Protocol
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114 Applets
115 NIO Networking
116 New File I/O
117 Secure objects
118 Pitfalls - threads and concurrency
119 Splitting a string into fixed length parts
120 Pitfalls - nulls and NullPointerException
121 SecurityManager
122 JNDI
123 super keyword
124 java.util.Objects class
125 Java command: java and javaw
126 Atomic types
127 Floating Point Operations
128 Converting to and from strings
129 sun.misc.Unsafe
130 Java Memory Model
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142 Java SE 8 Features
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148 Java Editions, versions, releases and distributions
149 Dynamic method dispatch
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151 Security and cryptography
152 Generating Java Code
153 JShell
154 Benchmarks
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156 Multi-release JAR files
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159 Sockets
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176 Enum starting with a number
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180 StringBuffer
181 Choosing Collections
182 C++ Comparison
183 CompletableFuture
184 Contributors