B4J Question Merge PDF (SOLVED)

Sub AppStart (Args() As String)
    Log("PDFBox")
    Me.as(JavaObject).RunMethod("mulFile2One", Null)
End Sub
#if java
import org.apache.pdfbox.io.IOUtils;
import org.apache.pdfbox.multipdf.PDFMergerUtility;
import org.apache.pdfbox.io.RandomAccessStreamCache;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public static void mulFile2One() throws IOException{
        PDFMergerUtility mergePdf = new PDFMergerUtility();
        mergePdf.addSource(new File("D:\\test\\f1.pdf"));
        mergePdf.addSource(new File("D:\\test\\f2.pdf"));
        mergePdf.setDestinationFileName("D:\\test\\mul2one.pdf");
        RandomAccessStreamCache.StreamCacheCreateFunction streamCache
        = IOUtils.createMemoryOnlyStreamCache();
        mergePdf.mergeDocuments(streamCache);
    }
#End If