INT-3626: More Sonar Fixes

JIRA: https://jira.spring.io/browse/INT-3626

Remove Direct Array Usages.

With the increased use of java configuration and DSL, it
is no longer safe to directly use array arguments.

(Except in simple wrapper objects).

Avoid (or mark //NOSONAR) catch Throwable.

Remove unused field.

spring-integration-xml/src/main/java/org/springframework/integration/xml/transformer/XsltPayloadTransformer.java

@@ -17,6 +17,7 @@
 package org.springframework.integration.xml.transformer;
 
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.Map;
 import java.util.Map.Entry;
 
@@ -181,7 +182,7 @@ public class XsltPayloadTransformer extends AbstractXmlTransformer implements Be
 	}
 
 	public void setXsltParamHeaders(String[] xsltParamHeaders) {
-		this.xsltParamHeaders = xsltParamHeaders;
+		this.xsltParamHeaders = Arrays.copyOf(xsltParamHeaders, xsltParamHeaders.length);
 	}
 
 	@Override