Question

当我需要解析abig rdf文件时，我有一个maven项目。

我的代码是：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.eclipse.rdf4j.model.Model;
import org.eclipse.rdf4j.model.Statement;
import org.eclipse.rdf4j.model.impl.LinkedHashModel;
import org.eclipse.rdf4j.rio.RDFFormat;
import org.eclipse.rdf4j.rio.RDFHandlerException;
import org.eclipse.rdf4j.rio.RDFParseException;
import org.eclipse.rdf4j.rio.RDFParser;
import org.eclipse.rdf4j.rio.RDFWriter;
import org.eclipse.rdf4j.rio.Rio;
import org.eclipse.rdf4j.rio.helpers.StatementCollector;

public class ConvertOntology {

    public static void main(String[] args) throws RDFParseException, RDFHandlerException, IOException {
        // TODO Auto-generated method stub

        String file = "C:\\Users\\user\\Desktop\\fileA.rdf";

        File initialFile = new File(file);
        InputStream input = new FileInputStream(initialFile);


        RDFParser parser = Rio.createParser(RDFFormat.RDFXML);
        parser.setPreserveBNodeIDs(true); 

        Model model = new LinkedHashModel();
        parser.setRDFHandler(new StatementCollector(model));
        parser.parse(input, initialFile.getAbsolutePath());

        FileOutputStream out = new FileOutputStream("C:\\Users\\user\\Desktop\\fileB.rdf");
        RDFWriter writer = Rio.createWriter(RDFFormat.RDFXML, out);
        try {
          writer.startRDF();
          for (Statement st: model) {

                    writer.handleStatement(st);
          }
          writer.endRDF();
        }
        catch (RDFHandlerException e) {
         // oh no, do something!
        }
        finally {
          out.close();
        }
    }

}

该代码字适用于小文件，但对于大文件，我得到以下称呼

JAXP00010001: The parser has encountered more than "64000" entity expansions in this document; this is the limit imposed by the JDK

在eclipse中，我通过单击run >> runconfiguration >>参数来运行项目，然后在VM参数-DentityExpansionLimit = 1000000中进行设置。由于内存限制，我得到了一个新的专有名词：

the Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded

因此，我可以设置的最大堆大小小于文件所需的大小。所以我想在服务器上执行我的代码。通常，我通过以下方式在服务器上编译并运行我的Maven：

mvn compile
mv exec:java

我的问题：我通过

在Maven中设置-DentityExpansionLimit = 5000000

mvn -DentityExpansionLimit=5000000 exec:java

但是我得到一个原始的异常：

[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java (default-cli) on project rdf4j-getting-started: An exception occured while executing the Java class. null: InvocationTargetException: JAXP00010004: The accumulated size of entities is "50,000,018" that exceeded the "50,000,000" limit set by "FEATURE_SECURE_PROCESSING". [line 1, column 34] -> [Help 1]

如何解决这个问题？

Answer 1

使用mvn -Djdk.xml.totalEntitySizeLimit=0 -DentityExpansionLimit=0 exec:java解决了我的问题。希望对您有帮助

Answer 2

根据documentation，您可以使用负值删除限制。

JAXP00010004和java.lang.OutOfMemoryError：超出了GC开销限制

2 个答案: