Generating a reactive microservices architecture has compilation errors

[mraible]

Overview of the issue

I'm trying to create a reactive microservices architecture with the following JDL:

application {
  config {
    baseName gateway,
    reactive true,
    packageName com.okta.developer.gateway,
    applicationType gateway,
    authenticationType oauth2,
    prodDatabaseType postgresql,
    serviceDiscoveryType eureka,
    testFrameworks [protractor]
  }
  entities Blog, Post, Tag, Product
}

application {
  config {
    baseName blog,
    reactive true
    packageName com.okta.developer.blog,
    applicationType microservice,
    authenticationType oauth2,
    databaseType neo4j,
    devDatabaseType neo4j,
    prodDatabaseType neo4j,
    enableHibernateCache false,
    serverPort 8081,
    serviceDiscoveryType eureka
  }
  entities Blog, Post, Tag
}

application {
  config {
    baseName store,
    reactive true
    packageName com.okta.developer.store,
    applicationType microservice,
    authenticationType oauth2,
    databaseType mongodb,
    devDatabaseType mongodb,
    prodDatabaseType mongodb,
    enableHibernateCache false,
    searchEngine elasticsearch,
    serverPort 8082,
    serviceDiscoveryType eureka
  }
  entities Product
}

entity Blog {
  name String required minlength(3),
  handle String required minlength(2)
}

entity Post {
  title String required,
  content TextBlob required,
  date Instant required
}

entity Tag {
  name String required minlength(2)
}

entity Product {
  title String required,
  price BigDecimal required min(0),
  image ImageBlob
}

relationship ManyToOne {
  Blog{user(login)} to User,
  Post{blog(name)} to Blog
}

relationship ManyToMany {
  Post{tag(name)} to Tag{post}
}

paginate Post, Tag with infinite-scroll
paginate Product with pagination

microservice Product with store
microservice Blog, Post, Tag with blog

To use the latest code, I ran the following commands in my fork:

git pull upstream master
npm link

Then, I generated apps using jhipster jdl app.jdl.

When I try to run the gateway with ./mvnw -Pprod, I get a compilation error:

[INFO] ERROR in src/main/webapp/app/entities/blog/blog/blog-routing.module.ts:10:10 - error TS2305: Module '"./blog.module"' has no exported member 'BlogModule'.
[INFO]
[INFO] 10 import { BlogModule } from './blog.module';
[INFO]             ~~~~~~~~~~
[INFO] src/main/webapp/app/entities/blog/post/post-routing.module.ts:10:10 - error TS2305: Module '"./post.module"' has no exported member 'PostModule'.
[INFO]
[INFO] 10 import { PostModule } from './post.module';
[INFO]             ~~~~~~~~~~
[INFO] src/main/webapp/app/entities/blog/tag/tag-routing.module.ts:10:10 - error TS2305: Module '"./tag.module"' has no exported member 'TagModule'.
[INFO]
[INFO] 10 import { TagModule } from './tag.module';
[INFO]             ~~~~~~~~~
[INFO] src/main/webapp/app/entities/store/product/product-routing.module.ts:10:10 - error TS2305: Module '"./product.module"' has no exported member 'ProductModule'.
[INFO]
[INFO] 10 import { ProductModule } from './product.module';
[INFO]             ~~~~~~~~~~~~~
[INFO] src/main/webapp/app/entities/entity-routing.module.ts:9:83 - error TS2339: Property 'BlogBlogModule' does not exist on type 'typeof import("/Users/mraible/apps/gateway/src/main/webapp/app/entities/blog/blog/blog-routing.module")'.
[INFO]
[INFO] 9         loadChildren: () => import('./blog/blog/blog-routing.module').then(m => m.BlogBlogModule),
[INFO]                                                                                     ~~~~~~~~~~~~~~
[INFO] src/main/webapp/app/entities/entity-routing.module.ts:13:83 - error TS2339: Property 'BlogPostModule' does not exist on type 'typeof import("/Users/mraible/apps/gateway/src/main/webapp/app/entities/blog/post/post-routing.module")'.
[INFO]
[INFO] 13         loadChildren: () => import('./blog/post/post-routing.module').then(m => m.BlogPostModule),
[INFO]                                                                                      ~~~~~~~~~~~~~~
[INFO] src/main/webapp/app/entities/entity-routing.module.ts:17:81 - error TS2339: Property 'BlogTagModule' does not exist on type 'typeof import("/Users/mraible/apps/gateway/src/main/webapp/app/entities/blog/tag/tag-routing.module")'.
[INFO]
[INFO] 17         loadChildren: () => import('./blog/tag/tag-routing.module').then(m => m.BlogTagModule),
[INFO]                                                                                    ~~~~~~~~~~~~~
[INFO] src/main/webapp/app/entities/entity-routing.module.ts:21:90 - error TS2339: Property 'StoreProductModule' does not exist on type 'typeof import("/Users/mraible/apps/gateway/src/main/webapp/app/entities/store/product/product-routing.module")'.
[INFO]
[INFO] 21         loadChildren: () => import('./store/product/product-routing.module').then(m => m.StoreProductModule),
[INFO]                                                                                             ~~~~~~~~~~~~~~~~~~
[INFO]
[INFO] npm ERR! code ELIFECYCLE
[INFO] npm ERR! errno 2
[INFO] npm ERR! gateway@0.0.1-SNAPSHOT webpack: `node --max_old_space_size=4096 node_modules/webpack/bin/webpack.js "--config" "webpack/webpack.prod.js" "--profile"`
[INFO] npm ERR! Exit status 2
[INFO] npm ERR!
[INFO] npm ERR! Failed at the gateway@0.0.1-SNAPSHOT webpack script.

When I try to run the blog app with the same command, I get compilation errors in tests:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:testCompile (default-testCompile) on project blog: Compilation failure: Compilation failure:
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/TagResourceIT.java:[247,9] cannot find symbol
[ERROR]   symbol:   variable restTagMockMvc
[ERROR]   location: class com.okta.developer.blog.web.rest.TagResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/TagResourceIT.java:[249,17] cannot find symbol
[ERROR]   symbol:   method patch(java.lang.String)
[ERROR]   location: class com.okta.developer.blog.web.rest.TagResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/TagResourceIT.java:[254,24] cannot find symbol
[ERROR]   symbol:   method status()
[ERROR]   location: class com.okta.developer.blog.web.rest.TagResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/TagResourceIT.java:[276,9] cannot find symbol
[ERROR]   symbol:   variable restTagMockMvc
[ERROR]   location: class com.okta.developer.blog.web.rest.TagResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/TagResourceIT.java:[278,17] cannot find symbol
[ERROR]   symbol:   method patch(java.lang.String)
[ERROR]   location: class com.okta.developer.blog.web.rest.TagResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/TagResourceIT.java:[283,24] cannot find symbol
[ERROR]   symbol:   method status()
[ERROR]   location: class com.okta.developer.blog.web.rest.TagResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/TagResourceIT.java:[297,9] cannot find symbol
[ERROR]   symbol:   variable restTagMockMvc
[ERROR]   location: class com.okta.developer.blog.web.rest.TagResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/TagResourceIT.java:[299,17] cannot find symbol
[ERROR]   symbol:   method patch(java.lang.String)
[ERROR]   location: class com.okta.developer.blog.web.rest.TagResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/TagResourceIT.java:[304,24] cannot find symbol
[ERROR]   symbol:   method status()
[ERROR]   location: class com.okta.developer.blog.web.rest.TagResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/PostResourceIT.java:[323,9] cannot find symbol
[ERROR]   symbol:   variable restPostMockMvc
[ERROR]   location: class com.okta.developer.blog.web.rest.PostResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/PostResourceIT.java:[325,17] cannot find symbol
[ERROR]   symbol:   method patch(java.lang.String)
[ERROR]   location: class com.okta.developer.blog.web.rest.PostResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/PostResourceIT.java:[330,24] cannot find symbol
[ERROR]   symbol:   method status()
[ERROR]   location: class com.okta.developer.blog.web.rest.PostResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/PostResourceIT.java:[354,9] cannot find symbol
[ERROR]   symbol:   variable restPostMockMvc
[ERROR]   location: class com.okta.developer.blog.web.rest.PostResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/PostResourceIT.java:[356,17] cannot find symbol
[ERROR]   symbol:   method patch(java.lang.String)
[ERROR]   location: class com.okta.developer.blog.web.rest.PostResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/PostResourceIT.java:[361,24] cannot find symbol
[ERROR]   symbol:   method status()
[ERROR]   location: class com.okta.developer.blog.web.rest.PostResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/PostResourceIT.java:[377,9] cannot find symbol
[ERROR]   symbol:   variable restPostMockMvc
[ERROR]   location: class com.okta.developer.blog.web.rest.PostResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/PostResourceIT.java:[379,17] cannot find symbol
[ERROR]   symbol:   method patch(java.lang.String)
[ERROR]   location: class com.okta.developer.blog.web.rest.PostResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/PostResourceIT.java:[384,24] cannot find symbol
[ERROR]   symbol:   method status()
[ERROR]   location: class com.okta.developer.blog.web.rest.PostResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/BlogResourceIT.java:[314,9] cannot find symbol
[ERROR]   symbol:   variable restBlogMockMvc
[ERROR]   location: class com.okta.developer.blog.web.rest.BlogResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/BlogResourceIT.java:[316,17] cannot find symbol
[ERROR]   symbol:   method patch(java.lang.String)
[ERROR]   location: class com.okta.developer.blog.web.rest.BlogResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/BlogResourceIT.java:[321,24] cannot find symbol
[ERROR]   symbol:   method status()
[ERROR]   location: class com.okta.developer.blog.web.rest.BlogResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/BlogResourceIT.java:[344,9] cannot find symbol
[ERROR]   symbol:   variable restBlogMockMvc
[ERROR]   location: class com.okta.developer.blog.web.rest.BlogResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/BlogResourceIT.java:[346,17] cannot find symbol
[ERROR]   symbol:   method patch(java.lang.String)
[ERROR]   location: class com.okta.developer.blog.web.rest.BlogResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/BlogResourceIT.java:[351,24] cannot find symbol
[ERROR]   symbol:   method status()
[ERROR]   location: class com.okta.developer.blog.web.rest.BlogResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/BlogResourceIT.java:[366,9] cannot find symbol
[ERROR]   symbol:   variable restBlogMockMvc
[ERROR]   location: class com.okta.developer.blog.web.rest.BlogResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/BlogResourceIT.java:[368,17] cannot find symbol
[ERROR]   symbol:   method patch(java.lang.String)
[ERROR]   location: class com.okta.developer.blog.web.rest.BlogResourceIT
[ERROR] /Users/mraible/apps/blog/src/test/java/com/okta/developer/blog/web/rest/BlogResourceIT.java:[373,24] cannot find symbol
[ERROR]   symbol:   method status()
[ERROR]   location: class com.okta.developer.blog.web.rest.BlogResourceIT
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

Finally, in the store app, I get a compilation failure:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project store: Compilation failure
[ERROR] /Users/mraible/apps/store/src/main/java/com/okta/developer/store/web/rest/ProductResource.java:[154,21] incompatible types: cannot infer type-variable(s) R
[ERROR]     (argument mismatch; bad return type in lambda expression
[ERROR]       com.okta.developer.store.domain.Product cannot be converted to reactor.core.publisher.Mono<? extends R>)
[ERROR]
[ERROR] -> [Help 1]

Motivation for or Use Case

I'd like to write a blog post about our reactive microservices support.

Reproduce the error

Use latest code, npm link, create with JDL above, then run ./mvnw -Pprod in each directory.

JHipster Version(s)

Latest code on main branch.

JHipster configuration

I'm using Java 11.

openjdk 11.0.8 2020-07-14
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.8+10)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.8+10, mixed mode)

[pascalgrimaud]

There are 2 problems:

• the 1st related to Angular comes from [angular] Make angular entities module and components shareable. #12549 -> can you have a look plz @mshima ?
• the 2nd is related to webflux backend

[pascalgrimaud]

Thanks @mshima : the angular part should be easy to fix. It's just related to naming with Microservice

[mshima]

@pascalgrimaud not so simple.

generator-jhipster/generators/entity-client/templates/angular/src/main/webapp/app/entities/entity-management.module.ts.ejs

Line 56 in 07c32f0

export class <%= locals.microserviceName ? upperFirstCamelCase(locals.microserviceName) : '' %><%= entityAngularName %>Module {}

The locals variables just doesn't exists and it's used in many places, I will try to identify when it was lost.

[mshima]

The locals variables just doesn't exists and it's used in many places, I will try to identify when it was lost.

Just found it's provided by ejs. <%= locals.microserviceName %> === <% microserviceName %>

[mraible]

I tried it again with the latest code. After generating all projects, I tried running ./mvnw -Pprod in them. Results:

• gateway: Hangs after spring-boot-maven-plugin:2.3.4.RELEASE:run and AsciiArt
• blog: Same errors
• store: Same

Since I have the ability, I'm slapping a large bug bounty on this one. I'd love it if we had first-class reactive support.

[atomfrede]

@mraible Blog and Store should compile (maybe you can check?) but I have test errors (404 when using patch).
Regarding the gateway not starting up, did you start the registry (and keycloak)? I had the exact same error (just hangs, but starting in IDEA revealed more logs) because my registry was crashing.

[mraible]

I tried creating everything again and the same compilation errors from above still happen on Blog and Store. It's possible I didn't have the registry running and that's why it didn't start before. I did have to start it a couple of times before it'd stay up, so thanks for that. Now I get the following error in the gateway:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 
'connectionFactory' defined in class path resource [org/springframework/boot/autoconfigure/r2dbc/ConnectionFactoryConfigurations$Pool.class]: 
Bean instantiation via factory method failed; nested exception is 
org.springframework.beans.BeanInstantiationException: Failed to instantiate [io.r2dbc.pool.ConnectionPool]: 
Factory method 'connectionFactory' threw exception; nested exception is java.lang.IllegalArgumentException: 
Invalid URL: r2dbc:h2:file:./target/h2db/db/gateway;DB_CLOSE_DELAY=-1

[atomfrede]

The h2 problem I also realized. I think there was a similar problem once on the micronaut blueprint. Will have a look. Regarding the compilation errors are you sure you have used this branch to generate again?

[atomfrede]

The correct r2dbc url looks like this url: r2dbc:h2:file://././target/h2db/db/reactiveundertow;DB_CLOSE_DELAY=-1, see https://github.com/r2dbc/r2dbc-h2 and r2dbc/r2dbc-h2#150. So first it must be // to fix the startup error and ././ to fix the non implicit db file path during runtime.

[atomfrede]

As #12688 is merged I think this can be closed. regarding the bounty, I will donate parts of that to

• DKMS
• Wikimedia
• Mozilla