[jboss-jira] [JBoss JIRA] (JASSIST-243) Create class by abstract generic template

[ https://issues.jboss.org/browse/JASSIST-243?page=com.atlassian.jira.plugi... ] Karol Kowalczyk edited comment on JASSIST-243 at 2/12/15 3:10 AM: ------------------------------------------------------------------ I'd like to generate new class from generic abstract template. A try to get this by javassist like this: CtClass newClass = POOL.makeClass("test.templates.impl.GeneratedBigDecimalAction", genericAbstractTemplateClass); String newGenericSignature="<Ljava/math/BigDecimal;Ljava/lang/String;Ltest/impl/NumberLogic;>Ltest/impl/ActionRoot<Ljava/math/BigDecimal;Ljava/lang/String;Ltest/impl/NumberLogic;>;Ltest/templates/api/IActionNumber2<Ljava/math/BigDecimal;Ljava/lang/String;>;" newClass.setGenericSignature(genericSignature); newClass.writeFile("target\test-classes"); newClass.POOL.get(newClass.getName()); But when I try to compile java sources with generated newClass test.templates.impl.GeneratedBigDecimalAction.class, a have error like this: src\test\java\test\BigDecimalActionTest.java:[13,-1] cannot access test.templates.impl.GeneratedBigDecimalAction bad class file: target\test-classes\test\templates\impl\GeneratedBigDecimalAction.class bad signature: <null> bu Why? 1. source of template (generic abstract template) package test.templates.impl; import test.impl.INumberLogic; import test.impl.ActionRoot; import java.util.Collection; import test.templates.api.IActionNumber2; public abstract class AActionNumber< Dto extends Number, Pk, L extends INumberLogic<Dto, Pk>> extends ActionRoot<Dto, Pk, L> implements IActionNumber2<Dto, Pk> { final protected transient Logger logger = LoggerFactory .getLogger(getClass()); public AActionNumber() throws Exception { super(); } public Class<Dto> getPersistentClass() { Class<Dto> result = null; if (logic != null) { result = logic.getPersistentClass(); } return result; } @Override public String echo(String a) { return a; } } 2. generic super class ActionRoot: package test.impl; import java.lang.reflect.ParameterizedType; import java.lang.reflect.TypeVariable; public class ActionRoot< Dto extends Number, Pk, L extends INumberLogic<Dto, Pk>> { protected L logic; @SuppressWarnings({ "unchecked" }) public ActionRoot() throws Exception { Class<?> tmpClass = this.getClass(); while (!(tmpClass.getGenericSuperclass() instanceof ParameterizedType)) { tmpClass = tmpClass.getSuperclass(); } Class<L> logicBeanClass = (Class<L>) ((ParameterizedType) tmpClass .getGenericSuperclass()).getActualTypeArguments()[2]; try { logic = (L) logicBeanClass.newInstance(); } catch (Exception ex) { throw new Exception("Problem z utworzeniem obiektu beanu logic", ex); } } } 3. Generic interfaces: package test.impl; public interface INumberLogic<Dto extends Number, Pk> { Class<Dto> getPersistentClass(); } package test.templates.api; public interface IActionNumber2<Dto extends Number, Pk> { String echo(String a); } was (Author: karol.kowalczyk): I'd like to generate new class from generic abstract template. A try to get this by javassist like this: CtClass newClass = POOL.makeClass("test.templates.impl.GeneratedBigDecimalAction", genericAbstractTemplateClass); String newGenericSignature="<Ljava/math/BigDecimal;Ljava/lang/String;Ltest/impl/NumberLogic;>Ltest/impl/ActionRoot<Ljava/math/BigDecimal;Ljava/lang/String;Ltest/impl/NumberLogic;>;Ltest/templates/api/IActionNumber2<Ljava/math/BigDecimal;Ljava/lang/String;>;" newClass.setGenericSignature(genericSignature); newClass.writeFile("target/testClasses"); newClass.POOL.get(newClass.getName()); But when I try to compile java sources with generated newClass test.templates.impl.GeneratedBigDecimalAction.class, a have error like this: src\test\java\test\BigDecimalActionTest.java:[13,-1] cannot access test.templates.impl.GeneratedBigDecimalAction bad class file: target\test-classes\test\templates\impl\GeneratedBigDecimalAction.class bad signature: <null> bu Why? 1. source of template (generic abstract template) package test.templates.impl; import test.impl.INumberLogic; import test.impl.ActionRoot; import java.util.Collection; import test.templates.api.IActionNumber2; public abstract class AActionNumber< Dto extends Number, Pk, L extends INumberLogic<Dto, Pk>> extends ActionRoot<Dto, Pk, L> implements IActionNumber2<Dto, Pk> { final protected transient Logger logger = LoggerFactory .getLogger(getClass()); public AActionNumber() throws Exception { super(); } public Class<Dto> getPersistentClass() { Class<Dto> result = null; if (logic != null) { result = logic.getPersistentClass(); } return result; } @Override public String echo(String a) { return a; } } 2. generic super class ActionRoot: package test.impl; import java.lang.reflect.ParameterizedType; import java.lang.reflect.TypeVariable; public class ActionRoot< Dto extends Number, Pk, L extends INumberLogic<Dto, Pk>> { protected L logic; @SuppressWarnings({ "unchecked" }) public ActionRoot() throws Exception { Class<?> tmpClass = this.getClass(); while (!(tmpClass.getGenericSuperclass() instanceof ParameterizedType)) { tmpClass = tmpClass.getSuperclass(); } Class<L> logicBeanClass = (Class<L>) ((ParameterizedType) tmpClass .getGenericSuperclass()).getActualTypeArguments()[2]; try { logic = (L) logicBeanClass.newInstance(); } catch (Exception ex) { throw new Exception("Problem z utworzeniem obiektu beanu logic", ex); } } } 3. Generic interfaces: package test.impl; public interface INumberLogic<Dto extends Number, Pk> { Class<Dto> getPersistentClass(); } package test.templates.api; public interface IActionNumber2<Dto extends Number, Pk> { String echo(String a); } -- This message was sent by Atlassian JIRA (v6.3.11#6341)