javax.servlet.ServletException: Servlet.init() for servlet resteasy-servlet threw exception - web-services

Question

type Exception report
message
description The server encountered an internal error () that prevented it from >fulfilling this request.
>exception
>javax.servlet.ServletException: Servlet.init() for servlet resteasy-servlet >threw exception
org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)
java.lang.Thread.run(Thread.java:745)
root cause
>java.lang.RuntimeException: Failed to construct public com.ph.restful.main.StringServiceApplication()
org.jboss.resteasy.core.ConstructorInjectorImpl.construct(ConstructorInjectorImpl.java:144)
org.jboss.resteasy.spi.ResteasyDeployment.createFromInjectorFactory(ResteasyDeployment.java:282)
org.jboss.resteasy.spi.ResteasyDeployment.createApplication(ResteasyDeployment.java:259)
org.jboss.resteasy.spi.ResteasyDeployment.start(ResteasyDeployment.java:220)
org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.init(ServletContainerDispatcher.java:67)
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.init(HttpServletDispatcher.java:36)
org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)
java.lang.Thread.run(Thread.java:745)
root cause
>java.lang.StackOverflowError
java.util.HashMap.init(HashMap.java:330)
java.util.HashMap.<init>(HashMap.java:262)
java.util.HashMap.<init>(HashMap.java:281)
java.util.HashSet.<init>(HashSet.java:103)
com.ph.restful.main.StringServiceApplication.<init>(StringServiceApplication.java:12)
com.ph.restful.main.StringServiceApplication.<init>(StringServiceApplication.java:15)
com.ph.restful.main.StringServiceApplication.<init>(StringServiceApplication.java:15)
com.ph.restful.main.StringServiceApplication.<init>(StringServiceApplication.java:15)
com.ph.restful.main.StringServiceApplication.<init>(StringServiceApplication.java:15)
com.ph.restful.main.StringServiceApplication.<init>(StringServiceApplication.java:15)
com.ph.restful.main.StringServiceApplication.<init>(StringServiceApplication.java:15)
com.ph.restful.main.StringServiceApplication.<init>(StringServiceApplication.java:15)
com.ph.restful.main.StringServiceApplication.<init>(StringServiceApplication.java:15)
getting an error when I use my browser as http://localhost:8080/sample/rest/app/test that will return a json data type..
Product class
private String productname;
private String description;
private Integer price;
public String getProductname() {
return productname;
}
public void setProductname(String productname) {
this.productname = productname;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Integer getPrice() {
return price;
}
public void setPrice(Integer price) {
this.price = price;
}
StringService class
#Path("/app")
public class StringService {
#GET
#Path("/test")
#Produces("application/json")
public Product printSample2(){
Product prod = new Product();
prod.setProductname("Alaska Milk");
prod.setDescription("Milk for all");
prod.setPrice(300);
return prod;
}
}
StringServiceApplication
public class StringServiceApplication extends Application{
private Set<Object> singletons = new HashSet<Object>();
public StringServiceApplication(){
singletons.add(new StringServiceApplication());
}
#Override
public Set<Object> getSingletons(){
return singletons;
}
}
my web.xml
<context-param>
<param-name>resteasy.servlet.mapping.prefix</param-name>
<param-value>/rest</param-value>
</context-param>
<servlet>
<servlet-name>resteasy-servlet</servlet-name>
<servlet-class>
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
</servlet-class>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>com.ph.restful.main.StringServiceApplication</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>resteasy-servlet</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
my jboss-web.xml
<?xml version="1.0" encoding="UTF-8"?>
<jboss-web>
<context-root>sample</context-root>
</jboss-web>
my libraries on build path
-javassist-3.12.1.GA
-json-simple-1.1.1
-resteasy-jaxb-provider-2.2.1.ga
-resteasy-jaxrs-2.2.1.GA
-resteasy-jettison-provider
-scannotation-1.0.3

Answer 1

java.lang.StackOverflowError
public class StringServiceApplication extends Application{
public StringServiceApplication(){
singletons.add(new StringServiceApplication());
}
}
You're getting stack overflow because you are trying to instantiate the same class in its own constructor.
I think you mean to instantiate the StringService instead
public StringServiceApplication(){
singletons.add(new StringService());
}