pepper

Various Java utilities

Maven

Add pepper as dependency to your project through:

    <dependency>
         <groupId>io.github.solven-eu.pepper</groupId>
         <artifactId>pepper</artifactId>
         <version>${pepper.version}</version>
    </dependency>

pepper-java

Various utilities helping operating in Java on a daily basis.

Standard helpers

GCInspector is drop-in class providing standard logs related to GC activity

@Bean
	public IPepperThreadDumper pepperThreadDumper() {
		return new PepperThreadDump(ManagementFactory.getThreadMXBean());
	}

	@Bean
	public GCInspector gcInspector(IpepperThreadDumper pepperThreadDumper) {
		return new GCInspector(pepperThreadDumper);
	}

PepperLogHelper helps publishing relevant logs regarding memory and timings

Assert.assertEquals("0.09%", pepperLogHelper.getNicePercentage(123, 123456).toString());


Assert.assertEquals("9sec 600ms", pepperLogHelper.getNiceTime(9600).toString());
Assert.assertEquals("2min 11sec", pepperLogHelper.getNiceTime(131, TimeUnit.SECONDS).toString());


Assert.assertEquals("789B", pepperLogHelper.getNiceMemory(789L).toString());
Assert.assertEquals("607KB", pepperLogHelper.getNiceMemory(789L * 789).toString());
Assert.assertEquals("468MB", pepperLogHelper.getNiceMemory(789L * 789 * 789).toString());
Assert.assertEquals("360GB", pepperLogHelper.getNiceMemory(789L * 789 * 789 * 789).toString());
Assert.assertEquals("278TB", pepperLogHelper.getNiceMemory(789L * 789 * 789 * 789 * 789).toString());
Assert.assertEquals("214PB", pepperLogHelper.getNiceMemory(789L * 789 * 789 * 789 * 789 * 789).toString());

Fancy helpers

ObjectInputHandlingInputStream enables transmitting a raw InputStream through an ObjectInput

CartesianProductHelper helps computing covering cartesian products over sets defined by Collections and Maps.

PepperProcessHelper enables tracking the memory consumption of a process (would it be current JVM, a forked Process or any other process).

PepperProcessHelper.getProcessResidentMemory(processPID)

It were useful to investigate memory issues in Heroku.

MapPath

This module inspires itself from xpath and jsonPath to manipulate standard java.util.Map.

See map-path

<dependency>
	<groupId>io.github.solven-eu.pepper</groupId>
	<artifactId>map-path</artifactId>
	<version>4.4</version>
</dependency>

Upgrade from 2.X to 3.X

Change groupId from <groupId>com.github.cormoran-io.pepper</groupId> to <groupId>io.github.solven-eu.pepper</groupId> Change imported package from import cormoran.pepper.X to import eu.solven.pepper.X

Upgrade from 4.X to 5.X

Pepper requires a JDK17 from 5.0

Deprecated

MAT

We use to maintain a fork of MAT, dedicated to huge Heap-Analysis. This is still available in 4.x MAT

Spark

We use to maintain a set of projects demonstrating how to prepare a Spark-based job, as a SpringBoot application, workarounding various issues like excluding some libraries already provided by the Hadoop ecosystem. This is still available in 4.x Spark