This parent POM is made for great Java projects, handling Eclipse (partly IntelliJ IDEA) and optionally Project Lombok integration, having consistent Checkstyle and SpotBugs (successor of FindBugs) definitions in addition to even more Maven pre-configuration.
| Changelog | JavaDoc | Generated Reports |
Used technologies and main focus are:
Read below descriptions and tips to get started. In case you run into problems open an issue, in case you’d like to help with this document or one of the submodules feel free to create pull requests. There is still much that can be done.
This POM is made for development using Maven and Eclipse by handling some of its settings to comply with the projects settings. However you can use this POM together with any other IDE (such as IntelliJ IDEA) for sure.
Creating a new project has been simplified as much as possible.
pom.xml file pointing at the Parent POM project.mvn archetype:generate -DarchetypeGroupId=de.lars-sh -DarchetypeArtifactId=parent-archetype
mvn verify to test the POM and your infrastructure.<parent>
<groupId>de.lars-sh</groupId>
<artifactId>parent</artifactId>
<version><!-- TODO --></version>
<relativePath></relativePath>
</parent>
mvn verify to test the POM and your infrastructure.Remember to restart Eclipse to apply changes to project settings.
Snapshot builds are provided through GitHub Packages. To use one of them, configure the version of the parent dependency accordingly and add the below noted repository to your POM.
Beside having the possibility, please keep in mind, that snapshot builds might be either instable or even broken from time to time.
<repositories>
<repository>
<id>github-lars-sh-parent</id>
<name>GitHub Packages of de.lars-sh:parent</name>
<url>https://maven.pkg.github.com/lars-sh/parent</url>
</repository>
</repositories>
If not done earlier, install Project Lombok into Eclipse using the official installer by calling mvn de.lars-sh:jar-runner-maven-plugin:run -Dartifact=org.projectlombok:lombok:LATEST on the command line.
mvn initialize -P update-eclipse via command line to initialize the Eclipse settings.File, Import..., Existing Maven Projects and press Next.Finish.Alt + F5) to synchronize the Eclipse configuration with your pom.xml.Generated sources folders setting to Don't detect.pom.xml.target/generated-sources/delombok and select Mark Directory as, Unmark as Sources Root to remove it from the class path.There are multiple ways to set up the formatter as defined by this Parent POM. You might use the built-in formatter as described below or take the Eclipse Code Formatter plugin (recommended).
File, Settings...Editor, Code Style, Java.Scheme selection and choose Import Scheme, Eclipse XML Profile.target/formatter.xml. Press OK.Remark: When saving the formatter in IntelliJ IDEA you might get Cannot Save Settings. In that case some Eclipse formatter settings are not compatible with IntelliJ IDEA and need to be handled manually. Therefore go through each of the tabs and fix the boxes highlighted with a red border.
Even some of the predefined Save Actions can be configured inside IntelliJ IDEA through the Save Actions plugin.
By default a GitHub Action for pushes and pull requests is created, which executes your Maven project and fails on any kind of warning or error.
You can disable the creation of that GitHub Action using the Maven Property parent-pom.create-github-workflow-yml.
A second GitHub Action for releases can be enabled manually using the Maven Property parent-pom.create-github-release-yml. That workflow is triggered on creation of releases and deploys the selected commit to Maven Central.
For both you will need to configure secrets inside your GitHub project. You can do that at Settings > Secrets > New repository secret.
GPG_PRIVATE_KEY is mandatory and needs to be a GPG private key to sign your deployment artifacts, both snapshots and releases.
GPG_PASSPHRASE is the passphrase for the specified private key and can be omitted if your private key comes with an empty passphrase.
OSSRH_USERNAME is your OSSRH (Maven Central via Sonartype Nexus) username. It is used for the release action only.
OSSRH_TOKEN is an OSSRH (Maven Central via Sonartype Nexus) token. It is used for the release action only.
Upgrading existing projects to use this parent POM can be done step by step. As this parent specifies some strict rules, some validations might need to be skipped until others pass. The following sections describe the corresponding Maven Properties.
Skip the below checks and tests.
-P dirty
<skipTests>true</skipTests>
For projects of packaging type maven-archetype tests can be skipped using:
<archetype.test.skip>true</archetype.test.skip>
<checkstyle.skip>true</checkstyle.skip>
<formatter.skip>true</formatter.skip>
<jacoco.skip>true</jacoco.skip>
<cpd.skip>true</cpd.skip>
<pmd.skip>true</pmd.skip>
<spotbugs.skip>true</spotbugs.skip>
<mdep.analyze.skip>true</mdep.analyze.skip>
<tidy.skip>true</tidy.skip>
Skip the creation of optional packages and signing.
-P dirty-package
<maven.source.skip>true</maven.source.skip>
<maven.javadoc.skip>true</maven.javadoc.skip>
<gpg.skip>true</gpg.skip>
Taking your first steps using this POM is as simple as not using it. However it comes with a lot nicely pre-configured ingredients.
Or simply Lombok - is a Java library, that aims at minimizing boilerplate code, such as getters and setters or equals and hashCode without additional runtime dependencies.
Usage of Project Lombok is highly appreciated as it allows saving a lot boilerplate code to help focusing on the relevant parts of your code. Using this POM you are offered the folder src/main/lombok for your Lombok sources.
For existing Java sources you can create the folder src/main/java, which is not affected by Lombok. Sources of both folders can operate with each other. The src/test folder is structured just the same way.
At compile-time instead of Project Lombok its counterpart Delombok is used to generate Java sources from your Lombok sources inside target/generated-sources/delombok in case you need those for yourself to understand what’s going on, for debugging purposes, for documentation or even for revision control.
Most Project Lombok features are annotation based. However Lombok comes with some additional functionality making your code even more safe. This POM activates them.
Therefore all non-static fields in your Lombok sources are private and final instead of package-private and non-final. To change the visibility of fields use public, protected or @PackagePrivate. To make a field modifiable use @NonFinal.
Project Lombok examples with generated Java code as comment:
// private final String name;
String name;
// private String age;
@NonFinal
String age;
While Project Lombok comes pre-configured for Maven builds you still need to run its installer once to allow your IDE handle Lombok sources beautifully.
mvn de.lars-sh:jar-runner-maven-plugin:run -Dartifact=org.projectlombok:lombok:LATEST.Specify location... (bottom left) and select the IDEs path.Install / Update (bottom right, just above Quit Installer).In the rare case that you might explicitely avoid using lombok add the following properties to your Maven configuration.
<parent-pom.create-lombok-config>false</parent-pom.create-lombok-config>
<parent-pom.default-sources-folder>java</parent-pom.default-sources-folder>
Project Lombok consists of many different concepts to avoid boilerplate. The following ones are the most likely to use. See JavaDoc or the Features page for further details.
In case your constructor does not require checks feel free to to use one of the above constructor generating annotations.
The two annotations @Getter and @Setter can be used to generate getters and setters on either single fields or all fields of a class.
Writing a toString method is either exhausting or requires to bundle external libraries and a lot times writing equals and hashCode is just the same mess. These annotations handle those cases with no extra work at runtime.
As Java does not have a real namespace system, all methods need to be part of a class. This leads to helper classes containing only static methods while the class shouldn’t be instantiated at any time.
Warning: This annotations forces all methods inside its class to be static. In theory that’s absolutely fine, in practice that might bring you into trouble. So remember to make your methods static yourself!
I did not play around with these, though they seem to simplify two quite common cases.
The following Project Lombok features are disabled on default to minimize your risk.
The annotation @Builder is a great helper in writing builder classes. While its compatibility with null checks has been improved greatly, it still fails in Eclipse and IntelliJ IDEA and therefore is not recommended to be used.
This Lombok annotation adds non-null-checks to method and constructor parameters. Those are simple runtime checks, however we decided to go with compile-time checks as described in the next section.
Use try-with-resource statements instead.
These annotations both do not have their own implementation. Instead they apply some of the above described annotations to a class. That’s all fine.
However people tend to confuse some functionality, while using annotations on their own makes things even more clear to Lombok newbies.
@Data is the equivalent to @Getter @Setter @RequiredArgsConstructor @ToString @EqualsAndHashCode. @Value is the equivalent to @Getter @FieldDefaults(makeFinal=true, level=AccessLevel.PRIVATE) @AllArgsConstructor @ToString @EqualsAndHashCode.
Use de.larssh.utils.Finals.lazy(...) instead.
Usage example:
// this::expensive is not called on initialization.
Supplier<T> cached = Finals.lazy(this::expensive);
// Instead this::expensive is called on get.
cached.get();
// And its result is cached for all following calls of get.
cached.get();
Use de.larssh.utils.SneakyException instead.
Usage example:
try {
...
} catch (ExceptionToBeThrownInASneakyWay e) {
throw new SneakyException(e);
}
This is a pseudo-type similar to the var statement, but meant for local variables making them final. It is prohibited to not be confused with the var statement. In addition Eclipse is configured to make local variables final while formatting and saving.
Use the var statement supported by Java 9 and later.
When Java was introduced it came with null values, which can be compared to a reference into no-where. It’s often used for missing values or simply as additional or special value. Though null values need to be handled by developers, leading to NullPointerExceptions whenever they are not.
Finally Java 8 introduced the class Optional<T>. Optionals are simple containers for either the value empty or any typed non-null value. Therefore using optional objects force developers, force yourself, to think about edge cases.
Talking about non-null-checks often means talking about runtime checks. We decided to go with IDE supported compile-time checks instead of runtime checks to allow code checks while reducing runtime work load.
These compile-time checks work via type annotations introduced below.
As we decided to go with optionals any field or argument can be non-null by default. This can be done on package level.
Therefore create a file called package-info.java inside your package and insert the following code. That’s all.
@de.larssh.utils.annotations.NonNullByDefault
package ...;
In case you forgot to add that annotation Eclipse shows a warning.
Add edu.umd.cs.findbugs.annotations.Nullable to any method (for its return value) or argument in case it still needs to handle null values. This might be required while handling objects from outside your code or when inheriting classes with nullable values.
Inside your favorite IDE feel free to use its Maven-compatible build infrastrucure, e.g. auto-building in Eclipse. For release artifacts and in case of IDE problems the following Maven commands will help you. More information can be found at the Maven Lifecycle Reference.
mvn clean empties Mavens target directory
mvn install compiles and packages your project. Afterwards the packaged artifacts are installed to your local repository. Use mvn verify instead to compile and package without installing or mvn compile to compile only.
mvn site runs additional reports on your project. Open target/site/index.html to check its results afterwards.
Wherever possible the following four JAR files are packaged:
JAR files contain your CHANGELOG.md, README.md and the to-be-created LICENSE.txt file inside their META-INF folder. Those two are meant to be used for documentation. See the below section about generated files for further information.
In addition the JARs manifest includes a generated Class-Path to simplify execution and version information.
Optionally dependencies can be bundled to deploy and run a full-blown JAR file. See more information about this at the description of the Maven Property project.build.packageDependenciesPhase.
The following profiles can be activated by hand to handle some rare cases.
-P dirty skips code checks and tests
-P dirty-package skips the creation of optional packages
Additional profiles might be activated based on the build environment to guarantee compatibility.
This parent POM either predefines existing Maven Properties or introduces some own.
parent-pom.create-changelog-md handles if the projects CHANGELOG.md file should be generated. Set to false if the file should not be created if not existing. Default value is true, except if the CHANGELOG.md file already exists.
parent-pom.create-dependabot-yml handles if the projects .github/dependabot.yml file should be generated. Set to false if the file should not be created or overwritten. Default value is true.
parent-pom.create-github-release-yml handles if the projects .github/workflows/release.yml file should be generated. Set to true if the file should be created or overwritten. Default value is false.
parent-pom.create-github-workflow-yml handles if the projects .github/workflows/push-and-pull_request.yml file should be generated. Set to false if the file should not be created or overwritten. Default value is true.
parent-pom.create-gitignore handles if the projects .gitignore file should be generated. Set to “false” if the file should not be created or overwritten. Default value is true.
parent-pom.create-lombok-config handles if the projects lombok.config files should be generated. Set to false if the files should not be created or overwritten. Default value is true, except for packaging types pom and archetype.
parent-pom.create-readme-md handles if the projects README.md file should be generated. Set to false if the file should not be created if not existing. Default value is true, except if the README.md file already exists.
parent-pom.create-source-directories handles if the projects source directories shall be created. Set to false if the folder should not be created. Default value is true, except for packaging types pom and archetype.
parent-pom.create-travis-yml handles if the projects .travis.yml file should be generated. Set to true if the file shall be created or overwritten. Default value is false.
parent-pom.default-sources-folder is the name if the default source folders to be created. Default value is lombok.
parent-pom.github.organization is the GitHub organization name, used for documentary needs. Default value is lars-sh.
parent-pom.github.project is the GitHub project name, used for documentary needs. Default value is ${project.artifactId}.
eclipse.compiler.codegen.methodParameters configures Eclipse to respect the value specified for maven.compiler.parameters. Values can be generate or do not generate. Default value: do not generate, except if property maven.compiler.parameters equals true.
eclipse.compiler.javadoc is meant to be used by child POMs to configure if Eclipse should validate JavaDoc comments. Values can be enabled or disabled. Default value: enabled
eclipse.compiler.missingNonNullByDefaultAnnotation is meant to be used by child POMs to configure if Eclipse should enforce @NonNullByDefault annotations on every package. Values can be error, warning, info or ignore (disabled). Default value: warning
eclipse.compiler.nonnull.secondary is meant to be used by child POMs to configure secondary @NonNull annotations that Eclipse should handle. Multiple values must be separated by comma. Default value: empty
eclipse.compiler.nonnullbydefault.secondary is meant to be used by child POMs to configure secondary @NonNullByDefault annotations that Eclipse should handle. Multiple values must be separated by comma. Default value: empty
eclipse.compiler.nullAnalysis is meant to be used by child POMs to configure if Eclipse should do annotation based null analysis. Values can be enabled or disabled. Default value: enabled
eclipse.compiler.nullable.secondary is meant to be used by child POMs to configure secondary @Nullable annotations that Eclipse should handle. Multiple values must be separated by comma. Default value: edu.umd.cs.findbugs.annotations.CheckForNull
eclipse.compiler.potentialNullReference is meant to be used by child POMs to configure if Eclipse should warn on potential null pointer access. Values can be error, warning, info or ignore (disabled). Default value: error
jar.manifest.mainClass is meant to be used by child POMs to configure a default main class, e.g. “de.larssh.Main”. Default value: empty
shade.packageDependenciesPhase is meant to be used by child POMs to configure if an archive containing dependencies should be created. Values can be none (disabled) and package (enabled) as this property is used with the
aggregate: true
checkstyle.config.location: ${project.build.directory}/checkstyle.xml
checkstyle.consoleOutput: true
cpd.excludeFromFailureFile: ${project.basedir}/cpd-excludes.csv (if existing)
cpd.printFailingErrors: true
dependency.failOnWarning: true
dependency.ignoreUnusedRuntime: true
enforcer.requiredMavenVersion: 3.3.9
formatter.configFile: ${project.build.directory}/formatter.xml
formatter.lineEnding: LF
jar.manifest.addDefaultImplementationEntries: true
jar.manifest.addDefaultSpecificationEntries: true
jar.manifest.mainClass:
jar.skipIfEmpty: true
javadoc.quiet: true
maven.compiler.failOnWarning: true
maven.compiler.showDeprecation: true
maven.compiler.showWarnings: true
maven.compiler.source: 1.8
maven.compiler.target: 1.8
maven.javadoc.failOnWarnings: true
maven.version.rules: file:///${project.build.directory}/versions-ruleset.xml
nexus-staging.autoReleaseAfterClose: true
pmd-only.excludeFromFailureFile: ${project.basedir}/pmd-excludes.properties
pmd-only.printFailingErrors: true
pmd-only.ruleset: ${project.build.directory}/pmd-ruleset.xml
pmd.analysisCache: true
project.build.sourceEncoding: UTF-8
project.reporting.outputEncoding: UTF-8
shade.createDependencyReducedPom: true
shade.dependencyReducedPomLocation: ${project.build.directory}/dependency-reduced-pom.xml
shade.packageDependenciesPhase: none
spotbugs.effort: Max
spotbugs.threshold: Low
Some files are not generated automatically, but can be used to control the build process once created manually. Those files and how to fill them is described below.
checkstyle-rules.xml allows to add custom rules to the Parent POM’s Checkstyle configuration. The file contains all elements, that you’d probably put into the Checker module of a Checkstyle configuration. Therefore it might not be valid XML!
checkstyle-suppressions.xml allows to suppress Checkstyle findings. See the below section about suppressions for more information.
cpd-excludes.csv allows to suppress CPD findings. See the below section about suppressions for more information.
LICENSE.txt is put into the generated JAR’s META-INF folder. It is meant to be used for documentation.
pmd-excludes.properties allows to suppress CPD findings. See the below section about suppressions for more information.
spotbugs-excludes.xml allows to suppress Spotbugs findings. See the below section about suppressions for more information.
During the build process some project files are generated. Those files and their creation concept are described below.
CHANGELOG.md and README.md are your places. Insert your changes, a short project introduction, getting started information and user documentation. Templates are created only if the files do not exist, yet.
.github/dependabot.yml tells Dependabot which project dependencies to check. Use the Maven property parent-pom.create-dependabot-yml to suppress writing this file.
.github/workflows/push-and-pull_request.yml tells GitHub Actions which kind of project to build. It is overwritten at every run to keep it up-to-date. Use the Maven property parent-pom.create-github-workflow-yml to suppress writing this file.
.gitignore tells Git which files to ignore. It is overwritten at every run to keep it up-to-date. Use the Maven property parent-pom.create-gitignore to suppress writing this file.
.travis.yml tells Travis CI which kind of project to build. To write this file, set the Maven property parent-pom.create-travis-yml to true.
Project Lombok sources are meant to be used inside lombok folders only. Its usage is restricted to prevent you from using functionality that might lead to problems. Outside Project Lombok is prohibited at all.
src/lombok.config prohibits Project Lombok usage from any source file. It is overwritten at every run. We plan to change this behaviour in future releases.
src/main/lombok/lombok.config and src/test/lombok/lombok.config allow some Project Lombok functionality inside those directories. They are overwritten at every run. We plan to change this behaviour in future releases.
Our Eclipse Integration mostly synchronizes settings of Maven plugins with your Eclipse settings. Remember to restart Eclipse after building a new or updated child project.
.checkstyle contains the Eclipse Checkstyle plugin configuration. It gets overwritten with each update from inside Eclipse.
.settings/checkstyle.xml contains the Checkstyle rules. It gets overwritten with each update from inside Eclipse.
.settings/edu.umd.cs.findbugs.core.prefs contains the Eclipse SpotBugs Plugin configuration. Some properties are overwritten with each update from inside Eclipse.
.settings/org.eclipse.core.resources.prefs contains the default sources encoding. Some properties are overwritten with each update from inside Eclipse.
.settings/org.eclipse.core.runtime.prefs contains the default sources line feed. Some properties are overwritten with each update from inside Eclipse.
.settings/org.eclipse.jdt.core.prefs contains Compiler and Code Completion configuration and Formatter rules. Some properties are overwritten with each update from inside Eclipse.
.settings/org.eclipse.jdt.ui.prefs contains Save Actions and Cleanup configuration. Some properties are overwritten with each update from inside Eclipse.
The following files are generated for the build process itself. You should not need to know them for your regular work.
target/checkstyle.xml contains the Checkstyle rules. It is overwritten at the Maven goal initialize.
target/formatter.xml contains the formatting rules. It is overwritten at the Maven goal initialize.
target/mvn-suppressions-parent.sh contains a script that filters the Maven errors and warnings output when processed by GitHub Actions and Travis CI based on a list of global suppressions. It is overwritten at the Maven goal initialize.
target/pmd/pmd-ruleset.xml contains the PMD rule set. It is overwritten at the Maven goal initialize.
target/versions-ruleset.xml contains a rule set used by the Maven Versions Plugin to ignore pre-release versions. It is overwritten at the Maven goal initialize.
As this POM comes with some code check and validation tools you might need to suppress false-positives.
There are two ways to suppress Checkstyle warnings.
SuppressWarnings annotation as shown below.@SuppressWarnings("checkstyle:MagicNumber")
checkstyle-suppressions.xml. See SuppressionXPathFilter and SuppressionFilter for more information. The following lines show an example suppressions file.<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suppressions PUBLIC "-//Checkstyle//DTD SuppressionXpathFilter Experimental Configuration 1.2//EN" "https://checkstyle.org/dtds/suppressions_1_2_xpath_experimental.dtd">
<suppressions>
<!-- Allow magic numbers inside static initialization blocks -->
<suppress-xpath checks="MagicNumberCheck" query="//STATIC_INIT/descendant-or-self::node()" />
<!-- Lombok: Suppress specific unused imports -->
<suppress checks="UnusedImports" message="^Unused import - lombok\.ToString\.$" />
<!-- Unit Tests -->
<suppress checks="JavadocPackage" files="^.*[/\\]generated-test-sources[/\\].*$" />
</suppressions>
More information about SpotBugs warnings can be found at one of the below resources.
There are two ways to suppress SpotBugs warnings.
SuppressFBWarnings annotation as shown below. Inserting a justification information is mandatory.@SuppressFBWarnings(value = "REC_CATCH_EXCEPTION", justification = "catching any exception at execution root")
spotbugs-excludes.xml. See Filter for more information.Create a file called cpd-excludes.csv. See Violation Exclusions for more information. The following lines show an example file.
com.example.ClassA,com.example.CopyOfClassA
com.example.ClassB,com.example.CopyOfClassB
Remark: While the notation inside the CPD exclude files seems class-path-alike, matching is based on the scheme pathOfFileWithDuplicate.replace('/', '.').replace('\\', '.').contains(classPathAlikeExclude). Therefore subclasses cannot be matched in an exact manner. Use the files path (replacing slashes with dots) instead.
There are two ways to suppress PMD warnings.
java.lang.SuppressWarnings annotation as shown below.@SuppressWarnings("PMD.EmptyCatchBlock")
@SuppressWarnings({ "PMD.EmptyCatchBlock", "PMD.UnusedPrivateField" })
pmd-excludes.properties. See Violation Exclusions for more information. The following lines show an example file.com.example.ClassA=UnusedPrivateField
com.example.ClassB=EmptyCatchBlock,UnusedPrivateField
The Maven Dependency Plugin performs bytecode-level analysis and therefore might cause incomplete results. You can force dependencies as used using:
<build>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<configuration>
<usedDependencies combine.children="append">
<usedDependency>[groupId]:[artifactId]</usedDependency>
</usedDependencies>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
In case you really need to suppress a dependency warning from the “declared but unused” list, use the ignoredUnusedDeclaredDependencies property, which is further described on the Maven Dependency Plugin page.
Make sure to use the attribute combine.children="append" as shown above, as the Parent POM ignores some dependencies for you already.
<build>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<configuration>
<ignoredUnusedDeclaredDependencies combine.children="append">
<ignoredUnusedDeclaredDependency>[groupId]:[artifactId]:[type]:[version]</ignoredUnusedDeclaredDependency>
</ignoredUnusedDeclaredDependencies>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
In case you really need to suppress a dependency warning from the “used but undeclared” list, use the ignoredUsedUndeclaredDependencies property, which is further described on the Maven Dependency Plugin page.
<build>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<configuration>
<ignoredUsedUndeclaredDependencies combine.children="append">
<ignoredUsedUndeclaredDependency>[groupId]:[artifactId]:[type]:[version]</ignoredUsedUndeclaredDependency>
</ignoredUsedUndeclaredDependencies>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
Use the de.larssh.utils.annotations.SuppressJacocoGenerated annotation to indicate that JaCoCo should ignore the annotated type, constructor or method.
Create a file called mvn-suppressions.sh, that filters the Maven errors and warnings output on stdin when processed by GitHub Actions and Travis CI. Remember to give the file execution permissions, e.g. using git update-index --chmod=+x mvn-suppressions.sh. The following lines show an example file.
# Suppress lines that contain the word "first"
function suppressFirst() {
cat < /dev/stdin | grep --invert-match "first"
}
# Suppress lines that contain the word "second"
function suppressSeconf() {
cat < /dev/stdin | grep --invert-match "second"
}
cat < /dev/stdin \
| suppressFirst \
| suppressSecond
We aim at using up-to-date dependencies and Maven plugins and minimizing runtime dependencies while still increasing safety and development ease.
The only runtime dependency (Maven scope: compile) used is de.lars-sh:utils, which comes with a bunch of generic utilities.
While it’s highly dicouraged you might need to remove that dependency in rare cases. Maven does not allow exluding dependencies from parent POMs however you can change the dependencies scope to test in such case.
<dependency>
<groupId>de.lars-sh</groupId>
<artifactId>utils</artifactId>
<scope>test</scope>
</dependency>
The following dependencies are used at compile-time (Maven scope: provided) only:
de.lars-sh:lombok-annotations)com.github.spotbugs:spotbugs-annotations)de.lars-sh:utils-annotationsTo simplify writing unit tests the following dependencies are available for unit tests.
de.lars-sh:utils-testorg.assertj:assertj-core)org.jooq:joor-java-8)org.junit.jupiter:junt-jupiter-api, org.junit.jupiter:junt-jupiter-engine, org.junit.platform:junt-platform-runner)org.mockito:mockito-core)TODO
TODO
TODO
TODO: These are run at compile time. Eclipse plugins are configured where possible.
TODO: JavaDoc is run at compile time.
TODO: Publishing requires signing your JARs. Follow Working with GPG Signatures as short introduction about signing and Guide to uploading artifacts to the Central Repository for more generic information.
TODO
In this appendix you can find additional technical sheets, referenced by aboves topics.
By default the Maven output contains no timestamp. This tip describes how to change that on your computer. Sadly this needs to be configured globally and not on a per-project base.
<maven-install-directory>/conf/logging/simplelogger.properties in your favorite folder.org.slf4j.simpleLogger.showDateTime=true
org.slf4j.simpleLogger.dateTimeFormat=HH:mm:ss,SSS