compile error (missing javax.Servlet and Undertow) while importing in eclipse

[Arnaud-Nauwynck]

Overview of the issue

importing a jhipster project does not compile in eclipse, but compiles in maven

Eclipse complains about missing class: javax.servlet.ServletException

The type javax.servlet.ServletException cannot be resolved. 
It is indirectly referenced from required .class 
files	WebConfigurerTest.java	/test-1/src/test/java/com/mycompany/myapp/config	

The project was not built since its build path is incomplete. 
Cannot find the class file for javax.servlet.ServletException. 
Fix the build path then try building this project

Adding

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

solved this first error, but there is 16 others (all concerning undertow) after:

The type io.undertow.Undertow$Builder cannot be resolved. It is indirectly referenced from required .class files	WebConfigurer.java

Adding this solves the remaining errors:

	 <dependency>
        	<groupId>org.springframework.boot</groupId>
	        <artifactId>spring-boot-starter-undertow</artifactId>
	        <scope>provided</scope>
	  </dependency>

Motivation for or Use Case

using eclipse..

Reproduce the error

create empty jhipster project, choosing maven
then import in eclipse using "import ... > existing maven project"

eclipse version : 2018-12, with jdk8, standard eclipse java, no plugins

Related issues

Suggest a Fix

adding this in the pom.xml solves the issue:

		<dependency>
		    <groupId>javax.servlet</groupId>
		    <artifactId>javax.servlet-api</artifactId>
		    <scope>provided</scope>
		</dependency>
		<dependency>
        	<groupId>org.springframework.boot</groupId>
	        <artifactId>spring-boot-starter-undertow</artifactId>
	        <scope>provided</scope>
	    </dependency>

JHipster Version(s)

JHipster version v5.8.1

JHipster configuration

Welcome to the JHipster Information Sub-Generator

JHipster Version(s)

test-1@0.0.0 D:\test-jhispter\test1                                                                        
`-- generator-jhipster@5.8.1                                                                                            
                                                                                                                        

JHipster configuration, a .yo-rc.json file generated in the root folder

.yo-rc.json file

                                                                                                                   
{                                                                                                                       
  "generator-jhipster": {                                                                                               
    "promptValues": {                                                                                                   
      "packageName": "com.mycompany.myapp",                                                                             
      "nativeLanguage": "en"                                                                                            
    },                                                                                                                  
    "jhipsterVersion": "5.8.1",                                                                                         
    "applicationType": "monolith",                                                                                      
    "baseName": "test1",                                                                                                
    "packageName": "com.mycompany.myapp",                                                                               
    "packageFolder": "com/mycompany/myapp",                                                                             
    "serverPort": "8080",                                                                                               
    "authenticationType": "jwt",                                                                                        
    "cacheProvider": "ehcache",                                                                                         
    "enableHibernateCache": true,                                                                                       
    "websocket": false,                                                                                                 
    "databaseType": "sql",                                                                                              
    "devDatabaseType": "h2Disk",                                                                                        
    "prodDatabaseType": "postgresql",                                                                                   
    "searchEngine": false,                                                                                              
    "messageBroker": false,                                                                                             
    "serviceDiscoveryType": false,                                                                                      
    "buildTool": "maven",                                                                                               
    "enableSwaggerCodegen": false,                                                                                      
    "clientFramework": "angularX",                                                                                      
    "useSass": true,                                                                                                    
    "clientPackageManager": "npm",                                                                                      
    "testFrameworks": [],                                                                                               
    "jhiPrefix": "jhi",                                                                                                 
    "entitySuffix": "",                                                                                                 
    "dtoSuffix": "DTO",                                                                                                 
    "otherModules": [],                                                                                                 
    "enableTranslation": true,                                                                                          
    "nativeLanguage": "en",                                                                                             
    "languages": [                                                                                                      
      "en"                                                                                                              
    ]                                                                                                                   
  }                                                                                                                     
}                                                                                                                       

JDL for the Entity configuration(s) entityName.json files generated in the .jhipster directory

JDL entity definitions

Environment and Tools

java version "1.8.0_202"
Java(TM) SE Runtime Environment (build 1.8.0_202-b08)
Java HotSpot(TM) 64-Bit Server VM (build 25.202-b08, mixed mode)

git version 2.17.0

node: v10.15.1

npm: 6.4.1

yeoman: 2.0.5

yarn: 1.13.0

Entity configuration(s) entityName.json files generated in the .jhipster directory

none

Browsers and Operating System

Windows 10.
browsers: any (compile time error)

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[pmverma]

I can confirm both the problem and suggested fix. I have encountered this a few times (randomly) with my STS 3 while the maven compiles fine. This is really an annoying error and you can not run the project or tests from the IDE.
It seems this is specific to eclipse IDE and its maven plugin.
I also would like to suggest to apply the fix in the jhipster pom.

[pascalgrimaud]

@Arnaud-Nauwynck @pmverma : can one of you do a PR to apply the fix ?

[cbornet]

Are you sure you activated either the "dev" or the "prod" Maven profile ?

[pmverma]

@cbornet No, I didn't activated maven profile manually in eclipse. I assume that it should work out-of-the-box and we have not to do so previously either. I will try it tonight and update here.

[jaydeep-punjani]

Hi @cbornet I can confirm, that after manually selecting the dev profile in eclipse. It works. But we didn't need to do this step previously, anything has changed?

[jaydeep-punjani]

@pmverma @cbornet on more observation related to this issue is, this does not occur when importing a freshly generated app and only happens after running jdl-import.

[pmverma]

This is also happening inside vscode and it is really annoying. I will do a PR with suggested fix very soon.

[cbornet]

The issue if I'm not mistaken is that the dev profile is not set. Adding the deps to the pom will probably not be enough as you should be either in dev profile or prod profile. We should even check that at runtime.

[jdubois]

yes that means the profile is not set, even though it's active by default in Maven (and that used to work!). So I'm guessing there is an issue in the Eclipse Maven plugin -> we should find a workaround, but most importantly this bug should reported to them (or we should find the existing ticket and link it here)

[pmverma]

Of course activating the profile manually in the eclipse project setting works fine. But I'm not sure how to do it in visual studio code. And yes this issue seems related to the eclipse Maven plugin.