Since having changed to fop 0.20.4 version the embedded rendering of from BATIK 
generated SVG does not work anymore. The following Error is produced:

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-
INFO] building formatting object tree
[INFO] [1]
[ERROR] svg graphic could not be built: null
java.lang.NullPointerException
	at java.util.Hashtable.get(Hashtable.java:320)
	at java.net.URL.getURLStreamHandler(URL.java:884)
	at java.net.URL.<init>(URL.java:305)
	at java.net.URL.<init>(URL.java:224)
	at java.net.URL.<init>(URL.java:243)
	at org.apache.batik.util.ParsedURLData.buildURL(Unknown Source)
	at org.apache.batik.util.ParsedURLData.openStreamInternal(Unknown 
Source)
	at org.apache.batik.util.ParsedURLData.openStream(Unknown Source)
	at org.apache.batik.util.ParsedURL.openStream(Unknown Source)
	at org.apache.batik.dom.svg.SAXSVGDocumentFactory.createDocument
(Unknown Source)
	at org.apache.batik.bridge.DocumentLoader.loadDocument(Unknown Source)
	at org.apache.batik.bridge.URIResolver.getNode(Unknown Source)
	at org.apache.batik.bridge.URIResolver.getElement(Unknown Source)
	at org.apache.batik.bridge.BridgeContext.getReferencedElement(Unknown 
Source)
	at org.apache.batik.bridge.CSSUtilities.convertClipPath(Unknown Source)
	at org.apache.batik.bridge.AbstractGraphicsNodeBridge.buildGraphicsNode
(Unknown Source)
	at org.apache.batik.bridge.SVGShapeElementBridge.buildGraphicsNode
(Unknown Source)
	at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(Unknown Source)
	at org.apache.batik.bridge.GVTBuilder.buildComposite(Unknown Source)
	at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(Unknown Source)
	at org.apache.batik.bridge.GVTBuilder.buildComposite(Unknown Source)
	at org.apache.batik.bridge.GVTBuilder.buildGraphicsNode(Unknown Source)
	at org.apache.batik.bridge.GVTBuilder.buildComposite(Unknown Source)
	at org.apache.batik.bridge.GVTBuilder.build(Unknown Source)
	at org.apache.fop.render.pdf.PDFRenderer.renderSVGDocument(Unknown 
Source)
	at org.apache.fop.render.pdf.PDFRenderer.renderSVGArea(Unknown Source)
	at org.apache.fop.svg.SVGArea.render(Unknown Source)
	at org.apache.fop.render.pdf.PDFRenderer.renderForeignObjectArea
(Unknown Source)
	at org.apache.fop.layout.inline.ForeignObjectArea.render(Unknown Source)
	at org.apache.fop.render.AbstractRenderer.renderLineArea(Unknown Source)
	at org.apache.fop.layout.LineArea.render(Unknown Source)
	at org.apache.fop.render.AbstractRenderer.renderBlockArea(Unknown 
Source)
	at org.apache.fop.layout.BlockArea.render(Unknown Source)
	at org.apache.fop.render.AbstractRenderer.renderBlockArea(Unknown 
Source)
	at org.apache.fop.layout.BlockArea.render(Unknown Source)
	at org.apache.fop.render.AbstractRenderer.renderAreaContainer(Unknown 
Source)
	at org.apache.fop.layout.ColumnArea.render(Unknown Source)
	at org.apache.fop.render.AbstractRenderer.renderSpanArea(Unknown Source)
	at org.apache.fop.layout.SpanArea.render(Unknown Source)
	at org.apache.fop.render.AbstractRenderer.renderBodyAreaContainer
(Unknown Source)
	at org.apache.fop.render.pdf.PDFRenderer.renderPage(Unknown Source)
	at org.apache.fop.render.pdf.PDFRenderer.render(Unknown Source)
	at org.apache.fop.apps.StreamRenderer.queuePage(Unknown Source)
	at org.apache.fop.layout.AreaTree.addPage(Unknown Source)
	at org.apache.fop.fo.pagination.PageSequence.format(Unknown Source)
	at org.apache.fop.apps.StreamRenderer.render(Unknown Source)
	at org.apache.fop.fo.FOTreeBuilder.endElement(Unknown Source)
	at org.apache.xerces.parsers.AbstractSAXParser.endElement
(AbstractSAXParser.java:559)
	at org.apache.xerces.impl.XMLNamespaceBinder.handleEndElement
(XMLNamespaceBinder.java:853)
	at org.apache.xerces.impl.XMLNamespaceBinder.endElement
(XMLNamespaceBinder.java:643)
	at org.apache.xerces.impl.dtd.XMLDTDValidator.handleEndElement
(XMLDTDValidator.java:2978)
	at org.apache.xerces.impl.dtd.XMLDTDValidator.endElement
(XMLDTDValidator.java:918)
	at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.handleEndElement
(XMLDocumentFragmentScannerImpl.java:1145)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement
(XMLDocumentFragmentScannerImpl.java:988)
	at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.
dispatch(XMLDocumentFragmentScannerImpl.java:1446)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument
(XMLDocumentFragmentScannerImpl.java:333)
	at org.apache.xerces.parsers.StandardParserConfiguration.parse
(StandardParserConfiguration.java:529)
	at org.apache.xerces.parsers.StandardParserConfiguration.parse
(StandardParserConfiguration.java:585)
	at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:147)
	at org.apache.xerces.parsers.AbstractSAXParser.parse
(AbstractSAXParser.java:1148)
	at org.apache.fop.apps.Driver.render(Unknown Source)
	at org.apache.fop.apps.Driver.run(Unknown Source)
	at com.csg.cs.tfw.util.document.processor.PDFDocumentProcessor.process
(PDFDocumentProcessor.java:73)
	at com.csg.cs.tfw.util.document.DocumentManager.render
(DocumentManager.java:128)
	at 
com.csg.cs.tfw.util.document.documentElements.graphic.test.TestDokument.<init>
(TestDokument.java:416)
	at 
com.csg.cs.tfw.util.document.documentElements.graphic.test.TestDokument.main
(TestDokument.java:485)

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The command line rendering works!!!