Java 9 warnings

mvn clean install -DskipTests

[WARNING] pdfbox/src/main/java/org/apache/pdfbox/cos/COSDocument.java:[472,20] finalize() in java.lang.Object has been deprecated
[WARNING] pdfbox/src/main/java/org/apache/pdfbox/pdmodel/font/PDFont.java:[310,27] getHeight(int) in org.apache.pdfbox.pdmodel.font.PDFontLike has been deprecated
[WARNING] pdfbox/src/main/java/org/apache/pdfbox/pdmodel/font/PDCIDFont.java:[286,27] getHeight(int) in org.apache.pdfbox.pdmodel.font.PDFontLike has been deprecated
[WARNING] pdfbox/src/main/java/org/apache/pdfbox/pdmodel/encryption/SecurityProvider.java:[50,41] newInstance() in java.lang.Class has been deprecated
[WARNING] pdfbox/src/main/java/org/apache/pdfbox/io/ScratchFileBuffer.java:[510,20] finalize() in java.lang.Object has been deprecated
[WARNING] pdfbox/src/main/java/org/apache/pdfbox/io/ScratchFileBuffer.java:[522,18] finalize() in java.lang.Object has been deprecated
[WARNING] preflight/src/main/java/org/apache/pdfbox/preflight/PreflightConfiguration.java:[185,25] newInstance() in java.lang.Class has been deprecated
[WARNING] debugger/src/main/java/org/apache/pdfbox/debugger/streampane/StreamTextView.java:[99,34] viewToModel(java.awt.Point) in javax.swing.text.JTextComponent has been deprecated
[WARNING] debugger/src/main/java/org/apache/pdfbox/debugger/streampane/tooltip/ToolTipController.java:[140,35] getPositionAbove(javax.swing.text.JTextComponent,int,int) in javax.swing.text.Utilities has been deprecated
[WARNING] debugger/src/main/java/org/apache/pdfbox/debugger/ui/textsearcher/Searcher.java:[191,60] modelToView(int) in javax.swing.text.JTextComponent has been deprecated
[WARNING] debugger/src/main/java/org/apache/pdfbox/debugger/fontencodingpane/Type3Font.java:[166,19] appendRawCommands(byte[]) in org.apache.pdfbox.pdmodel.PDPageContentStream has been deprecated