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POJSP - TransformerFactory.newInstance().newTransformer(xsl) returning null?
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The java API guarantees that it will never return a null - but for me, it is! <a href="http://download.oracle.com/javase/6/docs/api/javax/xml/transform/TransformerFactory.html#newTransformer(javax.xml.transform.Source" rel="nofollow">http://download.oracle.com/javase/6/docs/api/javax/xml/transform/TransformerFactory.html#newTransformer(javax.xml.transform.Source</a>) Relevant code: <pre><code>xml = new StreamSource(new URL(mondialURL).openStream()); xsl = new StreamSource(new File("/REMOVED/countriesnofilter.xsl")); result = new StreamResult(new PrintWriter(out)); transformer = TransformerFactory.newInstance().newTransformer(xsl); transformer.transform(xml, result); </code></pre> Since xml, xsl and result were made something using new, they -must- contain not null, so it must be transformer that's becoming null. Why is this happening and how can I fix it? Throws this: org.apache.jasper.JasperException: Exception in JSP: /dca/ass2/a.jsp:46 <pre><code>43: result = new StreamResult(new PrintWriter(out)); 44: 45: transformer = TransformerFactory.newInstance().newTransformer(xsl); 46: transformer.transform(xml, result); 47: 48: %> 49: <INPUT TYPE="SUBMIT" VALUE="Get one country"> Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:451) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244) java.security.AccessController.doPrivileged(Native Method) javax.security.auth.Subject.doAsPrivileged(Subject.java:517) org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276) org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162) root cause java.lang.NullPointerException org.apache.jsp.dca.ass2.a_jsp._jspService(a_jsp.java:104) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) sun.reflect.GeneratedMethodAccessor50.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244) java.security.AccessController.doPrivileged(Native Method) javax.security.auth.Subject.doAsPrivileged(Subject.java:517) org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276) org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162) </code></pre> EDIT: It is DEFINITELY the case that the transformer is null somehow. Watch: org.apache.jasper.JasperException: Exception in JSP: /dca/ass2/a.jsp:49 <pre><code>46: 47: xml.getInputStream(); 48: xsl.getInputStream(); 49: transformer.reset(); 50: 51: //transformer.transform(xml, result); 52: </code></pre> And it's a null pointer exception again. If it was because xml was null then it would have thrown an NPE at 47. EDIT2: If I change newTransformer(xsl) to newTransformer() it works, so it's a problem in newTransformer(xsl).
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JSP - TransformerFactory.newInstance().newTransformer(xsl) returning null?
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