Java - nimrody/knowledgebase GitHub Wiki

• List of new java features from Java 9 to 21

Packaging java apps

• Hermetic Java https://cr.openjdk.org/~jiangli/hermetic_java.pdf

• Jib - https://github.com/GoogleContainerTools/jib - build containers without docker (for java)

Misc

• Java testing best practices

• Creating command line apps with picocli and graalVM

Spring framework

• QueryDSL

Other

• Using Bytebuddy to generate java agents

Testing

• Approval Tests Testing framework that generates reference by running the test and recording the result

• HTML unit for testing webapps

Logging

• Beautiful Logger

• Dropwizard views

• OQL - visualvm heap dump query language tutorial

  For example to find all strings containing liveCatalog:

  select {instance: s, content: s.toString()} from java.lang.String s where /liveCatalog/.test(s.toString())

  To get static fields of a class

  select heap.findClass("server.Backend").statics.pusher

  Count objects of specific class:

  select count(heap.objects("reports.model.EventWithHeader"))

  Get retained size of all objects of type

  select sum(heap.objects("reports.model.EventWithHeader"), function(it) { return rsizeof(it); })

• Regular expression debugger

Java parsers

• JPAL

• Netflix rewrite

• INRIA Spoon source transformation

• JavaSymbolSolver

• JavaParser

• Java compiler API

  • Compiler overview
  • Compiler Tree API
  • JAVAC intro
  • TreePathScanner - internal API
  • ElementScanner
  • Example plugin

• IntelliJ standalone parser

  • Standalone parser dependencies
  • Standalone parser symbol resolution
  • Intellij plugin in less than 30 mintues

JNI

• JNI performance

• Efficient cooperation between java and native code

• Best practices for using JNI

• JNI primitive types

  • JVM bytecode

  • Introduction to Hotspot

    BaseType Character Type Interpretation B byte signed byte C char Unicode character code point in the Basic Multilingual Plane, encoded with UTF-16 D double double-precision floating-point value F float single-precision floating-point value I int integer J long long integer L ClassName ; reference an instance of class ClassName S short signed short Z boolean true or false [ reference one array dimension

• Java snippets

• Java monitoring

• Java exceptions

• Gradle build

• Java debugging techniques

• Java Unsafe

• Java unsafe

• Running an external process

• Another zlib implementation suitable for flushing contents

  Some information on Gzip implementation and the Deflate format

  An example implementation

• ByteBuffer class

• JVM tuning

• Functional Java

• Jetty

• Proycon - Decompiler and code generator (see also Lutyen) (dex to jar: jadx)

• CFR - Java decompiler

• Memory cost of data structures on the JVM

• Reflection

• Concurrency

• Awesome Java - libraries(https://github.com/shyiko/awesome-java)

• Cliff Click's blog

• Java logging - java.util.logging

• Reading from resource

  public static Schema getAvroSchema(String schemaFileName) throws IOException { try (InputStream is = ClassLoader.getSystemResourceAsStream(schemaFileName)) { Schema schema = new Schema.Parser().setValidate(true).parse(is); return schema; } }

Libraries

• TCP/IP implementation

• Java parser and Java symbol solver for analysing Java code.

SQL Libraries/ORM

• Copalis

• Dalesbred

• Generate Java models from SQL CREATE statements

Mockito

• nullable(String.class) to check for String or null

Tools

• Async profiler

Java modules

• Using jlink to create a custom java runtime