fix javadoc generation error with jdk 11
fix javadoc generation error with jdk 11

javadoc generation with jdk11 fails with error "javadoc: error - The code being documented uses modules but the packages defined in https://docs.oracle.com/javase/8/docs/api/ are in the unnamed module."

See https://bugs.openjdk.java.net/browse/JDK-8212233 for details.

ruddell/generator-jhipster,mosoft521/generator-jhipster,vivekmore/generator-jhipster,PierreBesson/generator-jhipster,ctamisier/generator-jhipster,hdurix/generator-jhipster,hdurix/generator-jhipster,mraible/generator-jhipster,PierreBesson/generator-jhipster,liseri/generator-jhipster,sendilkumarn/generator-jhipster,mraible/generator-jhipster,jhipster/generator-jhipster,sendilkumarn/generator-jhipster,sendilkumarn/generator-jhipster,ctamisier/generator-jhipster,liseri/generator-jhipster,liseri/generator-jhipster,pascalgrimaud/generator-jhipster,jhipster/generator-jhipster,atomfrede/generator-jhipster,pascalgrimaud/generator-jhipster,PierreBesson/generator-jhipster,sendilkumarn/generator-jhipster,atomfrede/generator-jhipster,duderoot/generator-jhipster,gmarziou/generator-jhipster,ruddell/generator-jhipster,cbornet/generator-jhipster,duderoot/generator-jhipster,dynamicguy/generator-jhipster,hdurix/generator-jhipster,gmarziou/generator-jhipster,hdurix/generator-jhipster,atomfrede/generator-jhipster,ctamisier/generator-jhipster,cbornet/generator-jhipster,jhipster/generator-jhipster,ruddell/generator-jhipster,vivekmore/generator-jhipster,mraible/generator-jhipster,wmarques/generator-jhipster,sendilkumarn/generator-jhipster,wmarques/generator-jhipster,pascalgrimaud/generator-jhipster,mosoft521/generator-jhipster,mosoft521/generator-jhipster,PierreBesson/generator-jhipster,hdurix/generator-jhipster,jhipster/generator-jhipster,PierreBesson/generator-jhipster,liseri/generator-jhipster,duderoot/generator-jhipster,atomfrede/generator-jhipster,cbornet/generator-jhipster,ctamisier/generator-jhipster,ruddell/generator-jhipster,vivekmore/generator-jhipster,vivekmore/generator-jhipster,pascalgrimaud/generator-jhipster,wmarques/generator-jhipster,dynamicguy/generator-jhipster,gmarziou/generator-jhipster,pascalgrimaud/generator-jhipster,ctamisier/generator-jhipster,dynamicguy/generator-jhipster,mosoft521/generator-jhipster,duderoot/generator-jhipster,mraible/generator-jhipster,wmarques/generator-jhipster,cbornet/generator-jhipster,mosoft521/generator-jhipster,gmarziou/generator-jhipster,liseri/generator-jhipster,gmarziou/generator-jhipster,wmarques/generator-jhipster,vivekmore/generator-jhipster,duderoot/generator-jhipster,ruddell/generator-jhipster,cbornet/generator-jhipster,dynamicguy/generator-jhipster,atomfrede/generator-jhipster,jhipster/generator-jhipster,mraible/generator-jhipster