Development-time Best Practices

There are several settings below we recommend you to specify during development time that can improve your developer experience. They can show you more debugging information and disable various caches to get the latest change without restarting a server.

Separate zk.xml for Development

Put these development-time settings in a separate file, so that you can easily remove it for production in the future.

zk.xml

    <library-property>
        <name>org.zkoss.zk.config.path</name>
        <value>/WEB-INF/zk-dev.xml</value>
    </library-property>

zk-dev.xml

	<system-config>
		<disable-zscript>false</disable-zscript>
	</system-config>
	<!-- show debug information -->
	<client-config>
		<debug-js>true</debug-js>
	</client-config>
	<library-property>
		<name>org.zkoss.zk.ui.versionInfo.enabled</name>
		<value>true</value>
	</library-property>
	<!-- disable various caches -->
	<library-property>
		<name>org.zkoss.zk.ZUML.cache </name>
		<value>false</value>
	</library-property>
	<library-property>
		<name>org.zkoss.zk.WPD.cache</name>
		<value>false</value>
	</library-property>
	<library-property>
		<name>org.zkoss.zk.WCS.cache</name>
		<value>false</value>
	</library-property>
	<library-property>
		<name>org.zkoss.web.classWebResource.cache</name>
		<value>false</value>
	</library-property>
	<library-property>
		<name>org.zkoss.util.label.cache</name>
		<value>false</value>
	</library-property>

Reloading Modified Java Class without Restarting a Server

Running your application with TravaOpenJDK11 with hot-swap supported JDK can achieve it. Run it with JVM option -XX:HotswapAgent. When you modify your java code, re-compile it, the JDK can automatically reload(hot-swap) the new class file that saves the time of restarting an application server.

Jetty Maven Plugin

Configure Jetty maven plugin in a pom.xml can start your project in a few seconds which speeds up the iteration of writing code and testing.

<build>
    <plugins>
        <!-- Run with Jetty -->
        <plugin>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-maven-plugin</artifactId>
            <version>9.4.27.v20200227</version>
        </plugin>
    </plugins>
</build>

Spring Boot

With Spring Boot, please reference this development config.