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# Start VM
boot2docker start

# Show VM status
boot2docker status

# Start an nginx container "web" on the docker_host (the vm)
# -d keeps the container running in the background
# -P publishes exposed ports from the container to your local host (öffnet die vom Container genutzten Ports)
# --name assigns a name to the container

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# Create a file and insert some text with the ">" operator
echo "my new site" > index.html

# Show PATH
echo $PATH # /usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

# /usr/local/bin is in the PATH by default

# Create symbolic link (symlink)
ln -s "/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl" /usr/local/bin/sublime

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REM Display text file in shell
type config.json

REM Show running processes
tasklist

REM Kill process bei PID
taskkill /pid 1060

REM Get Command Line and PID of one process

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-- Remove All Rows from a Table
TRUNCATE TABLE user;

-- Create a CHECK constraint to ensure consistency within the tables (e.g. for enumeration values or for consistency rules based on multiple columns)
-- Unnamed inline CHECK constraint
CREATE TABLE Persons (
  Age int CHECK (Age>=18)
);

-- Named inline CHECK constraint

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There is a MANIFEST.MF file in .jar files

It supports a wide range of functionality:
* electronic signing
* version control
* package sealing

It always sits in "META-INF/MANIFEST.MF"

The creation of a .jar file includes the creation of a default manifest file

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// imports a couple of java tasks
apply plugin: "java"

// List available tasks in the shell
> gradle tasks

// A Closure that configures the sourceSets Task
// Sets the main folder as Source folder (where the compiler is looking up the .java files)
sourceSets {
  main.java.srcDir "src/main"

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// VM Arguments vs. Program Arguments
// Program Arguments are accessible via the main() methods String[] args array
// VM Arguments are accessible via System.getProperty(<vm-arg-name>)
java [-D<vm-arg-name>=<vm-arg-value>] MyJavaProgram [<program-arg-value>]

// Activate Remote Debugging on JVM via Java Debug Wire Protocol (JDWP)
java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=7777

// Listening for a debugger to connect: Yes or No
// No: JVM tries to connect to a debugger under the "address" field

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// Find the entity with the latest insert timestamp
@Repository
public interface MyEntityRepo extends JpaRepository<MyEntity, Long> {
  MyEntity findFirstByOrderByInsertTimestampDesc();
}

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// Enable component-scanning and auto-configuration with @SpringBootApplication Annotation
// It combines @Configuration + @ComponentScan + @EnableAutoConfiguration
@SpringBootApplication
public class FooApplication {
  public static void main(String[] args) {
    // Bootstrap the application
    SpringApplication.run(FooApplication.class, args);
  }
}

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// Return JSON without Jackson mapping classes
@RequestMapping("/users") 
public @ResponseBody Map<String, String> getUsers () {
    
  Map<String, String> map = new HashMap<String, String>();
  map.put("user", "Clark Kent");
    
  return map;
}