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Handle Rejected Execution

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If

  1. you try to submit tasks to a shutdown Executor or
  2. the queue is saturated (only possible with bounded ones) and maximum number of Threads has been reached,

RejectedExecutionHandler.rejectedExecution(Runnable, ThreadPoolExecutor) will be called.

The default behavior is that you’ll get a RejectedExecutionException thrown at the caller. But there are more predefined behaviors available:

You can set them using one of the ThreadPool constructors: 

public ThreadPoolExecutor(int corePoolSize,
                      int maximumPoolSize,
                      long keepAliveTime,
                      TimeUnit unit,
                      BlockingQueue<Runnable> workQueue,
                      RejectedExecutionHandler handler) // <--

public ThreadPoolExecutor(int corePoolSize,
                      int maximumPoolSize,
                      long keepAliveTime,
                      TimeUnit unit,
                      BlockingQueue<Runnable> workQueue,
                      ThreadFactory threadFactory,
                      RejectedExecutionHandler handler) // <--

You can as well implement your own behavior by extending RejectedExecutionHandler interface: 

void rejectedExecution(Runnable r, ThreadPoolExecutor executor)
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Executor, ExecutorService and Thread pools:
* Executor ExecutorService and Thread pools
* ThreadPoolExecutor
* Retrieving value from computation - Callable
* submit vs execute exception handling differences
* Fire and Forget - Runnable Tasks
* Handle Rejected Execution
* Use cases for different types of concurrency constructs
* Wait for completion of all tasks in ExecutorService
* Use cases for different types of ExecutorService
* Scheduling tasks to run at a fixed time after a delay or repeatedly
* Using Thread Pools
Table Of Contents
0 Inheritance
1 Getting started with Java
2 Streams
3 Exceptions
4 Collections
5 Lambda Expressions
6 Generics
7 File I/O
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10 Maps
11 Strings
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13 Default Methods
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15 Basic Control structures
16 Concurrent Programming Threads
17 Console I/O
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19 Visibility controlling access to members of a class
20 Regular Expressions
21 Autoboxing
22 Documenting Java Code
23 Executor, ExecutorService and Thread pools
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25 JAXB
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27 Networking
28 Optional
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30 HttpURLConnection
31 Annotations
32 Audio
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34 Calendar and its Subclasses
35 Nashorn JavaScript engine
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38 Iterator and Iterable
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62 ThreadLocal
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84 The Classpath
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86 XML Parsing using JAXP
87 Reference Types
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90 XML XPath Evaluation
91 Performance Tuning
92 Parallel programming with ForkJoin framework
93 Common Pitfalls
94 Non-Access Modifiers
95 Java Compiler
96 XJC
97 Installing Java Standard Edition
98 Process
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100 Dates and Time using java.time
101 Fluent Interface
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103 Just in Time JIT compiler
104 FTP File Transfer Protocol
105 Java Native Access JNI
106 Modules
107 Pitfalls - exceptions
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109 ServiceLoader
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111 Object References
112 Pitfalss - performance
113 Creating Images Programmatically
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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133 Queues and deques
134 Runtime commands
135 NumberFormat
136 Security and Cryptograhy
137 Java Virtual Machine JVM
138 Unit Testing
139 JavaBean
140 Expressions
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142 Java SE 8 Features
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144 Packages
145 Concurrency and Money
146 Concurrent Collections
147 Using ThreadPoolExecutor in multi-threaded applications
148 Java Editions, versions, releases and distributions
149 Dynamic method dispatch
150 JMX
151 Security and cryptography
152 Generating Java Code
153 JShell
154 Benchmarks
155 Collection Factory Methods
156 Multi-release JAR files
157 Stack-Walking API
158 TreeMap and TreeSet
159 Sockets
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161 Using other scripting languages in Java
162 Functional interfaces
163 List vs. set
164 2D graphics
165 Reflection
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169 Local Inner class
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171 Immutable class
172 String Tokenizer
173 File upload to S3 / AWS
174 Readers and writers
175 Hashtable
176 Enum starting with a number
177 SortedMap
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180 StringBuffer
181 Choosing Collections
182 C++ Comparison
183 CompletableFuture
184 Contributors