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As I use JSONObject to parse payload, I occasionally found a exception is raised. A percentage symbol (%) is contained in the payload and java.net.URLDecoder.decode fail to decode it.

The solution is pretty simple: replace the percentage symbol as a encoded percentage symbol %25.

I used to be a VC programmer in past 10 years. Recently I start to do coding on java servlet that deployed on Tomcat. At first I even don’t know maven. So my project is growing with pure dynamic web project configuration.

The dependencies is annoying as my project growing. I decide to utilize maven to make my future more glowing. If you had the same problem and occasionally see this post, I bet you are a lucky guy.

Original configuration of my project is as the following:

Java 1.8

Java Servelet 3.1

Tomcat 8

Now let’s go thru it, the steps to convert are as the following:

1. Right click on your project in “Project Explorer”, tap “Configure -> Convert to maven project”.

2. Tap finish in the dialog if you would like to use the default setting.

3. Edit “.settings/org.eclipse.wst.common.project.facet.core.xml“ in your project folder. Make sure version is corresponded to the one in your original configuration.

<installed facet="java" version="1.8"/> <installed facet="jst.web" version="3.1"/>

4. Edit web.xml. make sure the web-app tag is ref to servlet 3.1

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee" xmlns:web="http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee">

5. Edit pom.xml, add dependency of java servlet 3.1

<dependency>    <groupId>javax.servlet</groupId>    <artifactId>javax.servlet-api</artifactId>    <version>3.1.0</version>    <scope>provided</scope> </dependency>

6. Right click on your project in “Project Explorer”, tap “Maven-> Update Project”. Choose your project and tap “OK”