Christian Schlichtherle created OWB-873:
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Summary: NoSuchMethodException if no constructor with an empty
parameter list is present AND the bean has @Decorator beans
Key: OWB-873
URL: https://issues.apache.org/jira/browse/OWB-873
Project: OpenWebBeans
Issue Type: Bug
Components: Core, Interceptor and Decorators
Affects Versions: 1.2.0
Reporter: Christian Schlichtherle
Attachments: mavenproject1.zip
In my test project, I have a {{StandardPrinter}} bean which takes a
{{PrintStream}} as its sole constructor parameter. The bean archive descriptor
also configures three {{@Decorator}} classes which decorate the output of the
{{StandardPrinter}} bean.
Now, as a side effect of the decorator configuration, the container requires an
empty-parameter list constructor for the {{StandardPrinter}} class, although
this constructor is never actually called.
To reproduce the issue, build and run the attached standalone project. When run
unchanged, the program succeeds and prints the decorated output:
{code}
---------- BEGIN PRINT ----------
Hello world!
---------- END PRINT ----------
{code}
However, after removing the constructor {{ private StandardPrinter.<init>() {
... } }}, I get the following exception when running the program:
{code}
Exception in thread "main" org.apache.webbeans.proxy.ProxyGenerationException:
java.lang.NoSuchMethodException:
com.company.mavenproject1.StandardPrinter.<init>()
at
org.apache.webbeans.proxy.InterceptorDecoratorProxyFactory.createConstructor(InterceptorDecoratorProxyFactory.java:288)
at
org.apache.webbeans.proxy.AbstractProxyFactory.generateProxy(AbstractProxyFactory.java:211)
at
org.apache.webbeans.proxy.AbstractProxyFactory.createProxyClass(AbstractProxyFactory.java:175)
at
org.apache.webbeans.proxy.InterceptorDecoratorProxyFactory.createProxyClass(InterceptorDecoratorProxyFactory.java:186)
at
org.apache.webbeans.component.InjectionTargetBean.defineBeanInterceptorStack(InjectionTargetBean.java:172)
at
org.apache.webbeans.config.BeansDeployer.validate(BeansDeployer.java:426)
at
org.apache.webbeans.config.BeansDeployer.validateInjectionPoints(BeansDeployer.java:392)
at
org.apache.webbeans.config.BeansDeployer.deploy(BeansDeployer.java:195)
at
org.apache.webbeans.lifecycle.AbstractLifeCycle.startApplication(AbstractLifeCycle.java:129)
at
com.company.mavenproject1.boot.BootWebBeans.startApplication(BootWebBeans.java:36)
at com.company.mavenproject1.boot.BootWebBeans.run(BootWebBeans.java:27)
at
com.company.mavenproject1.boot.BootWebBeans.main(BootWebBeans.java:22)
Caused by: java.lang.NoSuchMethodException:
com.company.mavenproject1.StandardPrinter.<init>()
at java.lang.Class.getConstructor0(Class.java:2715)
at java.lang.Class.getDeclaredConstructor(Class.java:1987)
at
org.apache.webbeans.proxy.InterceptorDecoratorProxyFactory.createConstructor(InterceptorDecoratorProxyFactory.java:266)
... 11 more
{code}
As you can see from the constructor code, it's never actually called because it
would throw a {{new AssertionError()}}.
For comparison, I get similar results from Weld, the RI implementation, except
that Weld actually calls the constructor (it uses Class.newInstance() to
instantiate it).
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