Question

当使用JBOSS EAP 7和Apache FOP时，我在实例化一个新的Fop对象时随机（？）得到一个异常。重新启动后，代码可能会起作用。我怀疑有类加载问题。在独立情况下（Eclipse），一切正常。有人建议FOP实现已在不同的安全上下文中加载。击败我意味着什么。

以下是例外：由以下原因引起：java.lang.ClassCastException：org.apache.fop.render.afp.extensions.AFPExtensionHandlerFactory无法转换为org.apache.fop.util.ContentHandlerFactory

示例代码：

import java.io.File;

import javax.annotation.PostConstruct;
import javax.ejb.ConcurrencyManagement;
import javax.ejb.ConcurrencyManagementType;
import javax.ejb.Singleton;
import javax.ejb.Startup;

import org.apache.commons.io.output.NullOutputStream;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.apps.MimeConstants;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * Force classloader to use FOP apache implementations first (experimental)
 */
@Singleton
@Startup
@ConcurrencyManagement(ConcurrencyManagementType.BEAN)
public class InitBean {
    private static final Logger logger = LogManager.getLogger(InitBean.class.getName());

    public InitBean() {
        super();
    }

    @PostConstruct
    public void initClassloader() {
        try {
            FopFactory fopFactory = FopFactory.newInstance(new File(".").toURI());
            FOUserAgent foUserAgent = fopFactory.newFOUserAgent();
            Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, new NullOutputStream());
            logger.debug("Created FOP handler {}", fop.getDefaultHandler().getClass().getName());
        }
        catch (Exception e) {
            logger.error(e.getMessage());
        }
    }
}

库：Apache fop 2.2； xalan-2.7.2; docx4j-export-fo-6.0.1; xmlgraphics-commons-2.2; xercesImpl-2.11.0; docx4j-6.0.1; serializer-2.7.2

如何解决此问题？

使用FOP和JBOSS EAP 7

0 个答案: