A first draft of a JUnit @Rule that create the test context. This can be used with the Spring context rule for this post to create a complete Spring context for integration tests.
001 002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 018 019 020 021 022 023 024 025 026 027 028 029 030 031 032 033 034 035 036 037 038 039 040 041 042 043 044 045 046 047 048 049 050 051 052 053 054 055 056 057 058 059 060 061 062 063 064 065 066 067 068 069 070 071 072 073 074 075 076 077 078 079 080 081 082 083 084 085 086 087 088 089 090 091 092 093 094 095 096 097 098 099 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 | import org.apache.commons.dbcp.BasicDataSource;import org.apache.log4j.Logger;import org.junit.rules.TestRule;import org.junit.runner.Description;import org.junit.runners.model.Statement;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.NodeList; import javax.naming.Context;import javax.naming.InitialContext;import javax.naming.NamingException;import javax.sql.DataSource;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import java.io.*;import java.lang.reflect.Method;import java.sql.Driver;import java.sql.DriverManager; /** * Creates an context for tests using an Apache Tomcat server.xml. * * * @author alex.collins */public class TomcatContextRule implements TestRule { public static final Logger LOGGER = Logger.getLogger(CatalinaContextRule.class); /** * Creates all the sub-contexts for a name. */ public static void createSubContexts(Context ctx, String name) { String subContext = ''; for (String x : name.substring(0, name.lastIndexOf('/')).split('/')) { subContext += x; try { ctx.createSubcontext(subContext); } catch (NamingException e) { // nop } subContext += '/'; } } private final File serverXml; public TomcatContextRule(File serverXml, Object target) { if (serverXml == null || !serverXml.isFile()) {throw new IllegalArgumentException();} if (target == null) {throw new IllegalArgumentException();} this.serverXml = serverXml; } public Statement apply(final Statement statement, Description description) { return new Statement() { @Override public void evaluate() throws Throwable { createInitialContext(); try { statement.evaluate(); } finally { destroyInitialContext(); } } }; } private void createInitialContext() throws Exception { LOGGER.info('creating context'); System.setProperty(Context.INITIAL_CONTEXT_FACTORY, org.apache.naming.java.javaURLContextFactory.class.getName()); System.setProperty(Context.URL_PKG_PREFIXES, 'org.apache.naming'); final InitialContext ic = new InitialContext(); createSubContexts(ic, 'java:/comp/env'); final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); final DocumentBuilder builder = factory.newDocumentBuilder(); final Document document = builder.parse(serverXml); // create Environment { final NodeList envs = document.getElementsByTagName('Environment'); for (int i = 0; i < envs.getLength(); i++) { final Element env = (Element)envs.item(i); // must be Element final String name = 'java:comp/env/' + env.getAttribute('name'); final Object instance = Class.forName(env.getAttribute('type')).getConstructor(String.class) .newInstance(env.getAttribute('value')); LOGGER.info('binding ' + name + ' <' + instance + '>'); createSubContexts(ic, name); ic.bind(name, instance); } } // Resource { final NodeList resources = document.getElementsByTagName('Resource'); for (int i = 0; i < resources.getLength(); i++) { final Element resource = (Element)resources.item(i); // must be Element final String name = 'java:comp/env/' + resource.getAttribute('name'); final Class<?> type = Class.forName(resource.getAttribute('type')); final Object instance; if (type.equals(DataSource.class)) { { @SuppressWarnings('unchecked') // this mus be driver? final Class<? extends Driver> driverClass = (Class<? extends Driver>) Class.forName(resource.getAttribute('driverClassName')); DriverManager.registerDriver(driverClass.newInstance()); } final BasicDataSource dataSource = new BasicDataSource(); // find all the bean attributes and set them use some reflection for (Method method : dataSource.getClass().getMethods()) { if (!method.getName().matches('^set.*')) {continue;} final String x = method.getName().substring(3, 4).toLowerCase() + method.getName().substring(4); if (!resource.hasAttribute(x)) {continue;} Class<?> y = method.getParameterTypes()[0]; // might be primitive if (y.isPrimitive()) { if (y.getName().equals('boolean')) y = Boolean.class; if (y.getName().equals('byte')) y = Byte.class; if (y.getName().equals('char')) y = Character.class; if (y.getName().equals('double')) y = Double.class; if (y.getName().equals('float')) y = Float.class; if (y.getName().equals('int')) y = Integer.class; if (y.getName().equals('long')) y = Long.class; if (y.getName().equals('short')) y = Short.class; if (y.getName().equals('void')) y = Void.class; } method.invoke(dataSource, y.getConstructor(String.class).newInstance(resource.getAttribute(x))); } instance = dataSource; } else { // not supported, yet... throw new AssertionError('type ' + type + ' not supported'); } LOGGER.info('binding ' + name + ' <' + instance + '>'); createSubContexts(ic, name); ic.bind(name, instance); } } } private void destroyInitialContext() { System.clearProperty(Context.INITIAL_CONTEXT_FACTORY); System.clearProperty(Context.URL_PKG_PREFIXES); LOGGER.info('context destroyed'); } } |
For example:
1 2 3 | @Rule public TestRule rules = RuleChain.outerRule(new CatalinaContextRule(new File(getClass().getResource('/server.xml').getFile()), this)) .around(new ContextRule(new String[] {'/applicationContext.xml'}, this)); |
This code is on Github.
Reference: Tomcat Context JUnit @Rule from our JCG partner Alex Collins at the Alex Collins ‘s blog blog.
