我回答我自己的问题真的很晚，但我最终找到了内置 IDE 机制之外的解决方案.我使用

然后插件将运行并安装一个 package.json 和一个节点运行时在一个单独的目录中，该目录不会与您的项目捆绑在一起，您可以在那里编辑它并重新运行目标.

Using Netbeans 8.2, I've created a new MAVEN web application. I have placed a working package.json file inside the Web Pages folder so it's path is

C:\Users\xxx\Documents\NetBeansProjects\MyApp\src\main\webapp\package.json

I left click on the package.jsonfile and click the npm install option. I was then greeted by these errors/warnings

"C:\Program Files\nodejs\npm.cmd" "install"
npm WARN ENOENT ENOENT: no such file or directory, open 'C:\Users\Nick\Documents\NetBeansProjects\MyApp\package.json'
npm WARN EPACKAGEJSON C:\Users\xxx\Documents\NetBeansProjects\MyApp No description
npm WARN EPACKAGEJSON C:\Users\xxx\Documents\NetBeansProjects\MyApp No repository field.
npm WARN EPACKAGEJSON C:\Users\xxx\Documents\NetBeansProjects\MyApp No README data
npm WARN EPACKAGEJSON C:\Users\xxx\Documents\NetBeansProjects\MyApp No license field.
Done.

I noticed Netbeans attempted to look for the package.json at the wrong place

C:\Users\Nick\Documents\NetBeansProjects\MyApp\package.json'

And I can't seem to figure out how to tell the IDE where to look for it.

When I go to

Project Properties > JavaScript Libraries > npm

I get an empty view with

package.json not found

My question is, how can I setup netbeans to see that 'package.json' and run it? It worked fine when I tried using it in a HTML5 project, but I need npm support for a Java web app project.

I'ts really late to answer my own question but I eventually found a solution outside the the builtin IDE mechanics. I used the frontend-maven-plugin to setup a local npm repo for my project. Than instead of using the npm install option given by the IDE, I used maven to define a goal, and run it using nbactions.xml.

1. To install the plugin, edit your pom.xml (snippet from here), add the plugin descriptor and the execution that will download and install npm inside your repo

   <plugins>
       <plugin>
           <groupId>com.github.eirslett</groupId>
           <artifactId>frontend-maven-plugin</artifactId>
           <version>1.8.0</version>
           <executions>
               <!-- Installs node + npm in your repo -->
               <execution>
                   <id>install node and npm</id>
                   <goals>
                       <goal>install-node-and-npm</goal>
                   </goals>
                   <phase>generate-resources</phase>
               </execution>
               ...
   

2. I've appended this code to the one above, it's an execution that runs npm install(snippet found here)

       ....
       <execution>
           <id>npm install</id>
           <goals>
               <goal>npm</goal>
           </goals>
   
           <!-- optional: default phase is "generate-resources" -->
           <phase>generate-resources</phase>
   
           <configuration>
               <!-- optional: The default argument is actually
               "install", so unless you need to run some other npm command,
               you can remove this whole <configuration> section.
               -->
               <arguments>install</arguments>
           </configuration>
       </execution>
   </plugin>
   

3. Create a package.json file (in the same directory where your pom is) and start putting stuff into it (example)

4. I've added a reference to the npm install goal inside nbactions.xml, I've gave it a display name of npm-install

   </actions>
       ...
       <action>
           <actionName>CUSTOM-npm-install</actionName>
           <displayName>npm-install</displayName>
           <goals>
               <goal>npm</goal>
           </goals>
       </action>
   </actions>
   

5. Then, right click on the Project (from the projects view) -> Run Maven -> npm-install

The plugin will then run and install a package.json and a node runtime in a seperate directory that won't be bundled with your project, you can edit it there and re-run the goal.