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log4j, log4j2

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log4j, log4j2:
*log4j log4j2
*How to get Log4j
*Setting up property file
*Properties-File to log to DB
*How to use Log4j in Java code
*Basic log4j2.xml configuration file
*Migrating from log4j 1.x to 2.x
*Filter Logoutput by level log4j 1.x
Table Of Contents
0Inheritance
1Getting started with Java
2Streams
3Exceptions
4Collections
5Lambda Expressions
6Generics
7File I/O
8Arrays
9Interfaces
10Maps
11Strings
12InputStreams and OutputStreams
13Default Methods
14Classes and Objects
15Basic Control structures
16Concurrent Programming Threads
17Console I/O
18Singletons
19Visibility controlling access to members of a class
20Regular Expressions
21Autoboxing
22Documenting Java Code
23Executor, ExecutorService and Thread pools
24Object Class Methods and Constructor
25JAXB
26Primitive Data Types
27Networking
28Optional
29Enums
30HttpURLConnection
31Annotations
32Audio
33Data Class
34Calendar and its Subclasses
35Nashorn JavaScript engine
36Java Native Interface (JNI)
37Remote Method Invocation (RMI)
38Iterator and Iterable
39Operators
40Asserting
41Scanner
42Properties Class
43Preferences
44Reflection API
45Constructors
46ByteBuffer
47Serialization
48JSON in Java
49Random Number Generation
50Recursion
51Polymorphism
52StringBuilder
53Refernce Data Types
54Bit Manipulation
55Java Agents
56Encapsulation
57Type Conversion
58BigInteger
59BigDecimal
60RSA Encryption
61Varargs Variable Arguments
62ThreadLocal
63Logging
64static keyword
65Disassembling and Decompling
66Resources on classpath
67log4j, log4j2
68JVM Flags
69Oracle Official Code Standard
70Character encoding
71Java Memory Management
72Immutable Objects
73Object Cloning
74Alternative Collections
75Lists
76BufferedWriter
77LocalTime
78Sets
79Comparable and Comparator
80JVM Tool Interface
81Nested and Inner Classes
82Apache Commons Lang
83Getters and Setter
84The Classpath
85Bytecode Modification
86XML Parsing using JAXP
87Reference Types
88Localization and Internationalization
89JAX-WS
90XML XPath Evaluation
91Performance Tuning
92Parallel programming with ForkJoin framework
93Common Pitfalls
94Non-Access Modifiers
95Java Compiler
96XJC
97Installing Java Standard Edition
98Process
99Command line argument processing
100Dates and Time using java.time
101Fluent Interface
102XOM - XML Object Model
103Just in Time JIT compiler
104FTP File Transfer Protocol
105Java Native Access JNI
106Modules
107Pitfalls - exceptions
108Pitfalls - language syntax
109ServiceLoader
110ClasssLoader
111Object References
112Pitfalss - performance
113Creating Images Programmatically
114Applets
115NIO Networking
116New File I/O
117Secure objects
118Pitfalls - threads and concurrency
119Splitting a string into fixed length parts
120Pitfalls - nulls and NullPointerException
121SecurityManager
122JNDI
123super keyword
124java.util.Objects class
125Java command: java and javaw
126Atomic types
127Floating Point Operations
128Converting to and from strings
129sun.misc.Unsafe
130Java Memory Model
131Java deployment
132Java plugin system implementations
133Queues and deques
134Runtime commands
135NumberFormat
136Security and Cryptograhy
137Java Virtual Machine JVM
138Unit Testing
139JavaBean
140Expressions
141Literals
142Java SE 8 Features
143Java SE 7 Features
144Packages
145Concurrency and Money
146Concurrent Collections
147Using ThreadPoolExecutor in multi-threaded applications
148Java Editions, versions, releases and distributions
149Dynamic method dispatch
150JMX
151Security and cryptography
152Generating Java Code
153JShell
154Benchmarks
155Collection Factory Methods
156Multi-release JAR files
157Stack-Walking API
158TreeMap and TreeSet
159Sockets
160Java Sockets
161Using other scripting languages in Java
162Functional interfaces
163List vs. set
1642D graphics
165Reflection
166Deque interface
167Enum Map
168EnumSet class
169Local Inner class
170Java Print Service
171Immutable class
172String Tokenizer
173File upload to S3 / AWS
174Readers and writers
175Hashtable
176Enum starting with a number
177SortedMap
178WeakHashMap
179LinkedHashMap
180StringBuffer
181Choosing Collections
182C++ Comparison
183CompletableFuture
184Contributors