0002657: PHP foreach fails when iterating over a Java list: java.lang.InstantiationException

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Category

Severity

Reproducibility

Date Submitted

Last Update

0002657

[Quercus]

major

always

05-09-08 14:59

05-29-08 19:29

Reporter

skleinjung

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Status

closed

Product Version

3.1.6

Summary

0002657: PHP foreach fails when iterating over a Java list: java.lang.InstantiationException

Description

The JavaListAdapter's copy() method is implemented by retrieving the Java class of the underlying list object and calling the newInstance method of that class. This operation fails if the list implementation does not have an accessible no-arg constructor, which is the case for many standard List implementations such as java.util.Collections.UnmodifiableRandomAccessList and java.util.Arrays.ArrayList.
Because the ForeachStatement's execute method uses the Value's copy implementation, attempts to iterate over these list types using foreach fails. The stack trace for this failure is included in the Additional Information section of this report.

I am attaching a war file that illustrates this issue. Deploy it to Resin version 3.1.6 and load it's index.php page to see the error.

Additional Information

com.caucho.quercus.QuercusRuntimeException: java.lang.InstantiationException: java.util.Collections$UnmodifiableRandomAccessList
        at com.caucho.quercus.env.JavaListAdapter.copy(JavaListAdapter.java:255)
        at com.caucho.quercus.program.ForeachStatement.execute(ForeachStatement.java:87)
        at com.caucho.quercus.program.BlockStatement.execute(BlockStatement.java:105)
        at com.caucho.quercus.program.QuercusProgram.execute(QuercusProgram.java:272)
        at com.caucho.quercus.page.InterpretedPage.execute(InterpretedPage.java:70)
        at com.caucho.quercus.page.QuercusPage.executeTop(QuercusPage.java:119)
        at com.caucho.quercus.servlet.ResinQuercusServlet.service(ResinQuercusServlet.java:149)
        at com.caucho.quercus.servlet.QuercusServlet.service(QuercusServlet.java:355)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:91)
        at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:103)
        at com.partslogistics.web.servlet.OpenSessionInViewFilter.doFilter(OpenSessionInViewFilter.java:27)
        at com.partslogistics.web.servlet.OpenSessionInViewFilter$$FastClassByCGLIB$$71be6d7d.invoke(<generated>)
        at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
        at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:696)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:631)
        at com.partslogistics.web.servlet.OpenSessionInViewFilter$$EnhancerByCGLIB$$7e85867f.doFilter(<generated>)
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:183)
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:138)
        at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:87)
        at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187)
        at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:266)
        at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:270)
        at com.caucho.server.port.TcpConnection.run(TcpConnection.java:678)
        at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:721)
        at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:643)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.InstantiationException: java.util.Collections$UnmodifiableRandomAccessList
        at java.lang.Class.newInstance0(Class.java:340)
        at java.lang.Class.newInstance(Class.java:308)
        at com.caucho.quercus.env.JavaListAdapter.copy(JavaListAdapter.java:248)
        ... 28 more

Attached Files

list-bug.war [^] (891 bytes) 05-09-08 14:59

JavaListAdapter.class [^] (5,717 bytes) 05-09-08 15:04

Relationships

Notes
(0003040) skleinjung 05-09-08 15:04	In order to fix this issue, the copy method of JavaListAdapter needs to use a different method of instantiating the copy. One possibility is to simply use a pre-selected list implementation. This is done by replacing line 248 of com.caucho.quercus.env.JavaListAdapter with something like the following: List list = new java.util.ArrayList(); I am successfully using this as a workaround for my application for the time being. However, I do not have enough information about how Quercus is implemented to know if this is a safe general-purpose solution or not. I am, however, attaching a patched version of the JavaListAdapter class file in case anyone else with this problem wants to try it as well.

Issue History
Date Modified	Username	Field	Change
05-09-08 14:59	skleinjung	New Issue
05-09-08 14:59	skleinjung	File Added: list-bug.war
05-09-08 14:59	skleinjung	Issue Monitored: skleinjung
05-09-08 15:04	skleinjung	Note Added: 0003040
05-09-08 15:04	skleinjung	File Added: JavaListAdapter.class
05-29-08 19:29	ferg	Assigned To	=> ferg
05-29-08 19:29	ferg	Status	new => closed
05-29-08 19:29	ferg	Resolution	open => fixed
05-29-08 19:29	ferg	Fixed in Version	=> 3.2.0

Mantis 1.0.0rc3[^]

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