public static  void bootstrap(ClassLoader classLoader) 
{
        Properties args = getAgentArgs(classLoader);
        debug = (args.getProperty("debug", "false").equalsIgnoreCase("true"));
        boolean enabled = (args.getProperty("enabled", "true").equalsIgnoreCase("true"));
        if (!enabled) {
            debug("disabled");
            return;
        }
        try {
            debug("searching for persistence.xml files");
            ArrayList< URL > urls = Collections.list(classLoader.getResources("META-INF/persistence.xml"));
            if (urls.size() == 0) {
                debug("no persistence.xml files found");
                return;
            }
            Map< String, Unit > units = new HashMap< String, Unit >();
            for (URL url : urls) {
                String urlPath = url.toExternalForm();
                debug("found " + urlPath);
                try {
                    InputStream in = url.openStream();
                    try {
                        collectUnits(in, units, args);
                    } catch (Throwable e) {
                        debug("failed to read " + urlPath, e);
                        in.close();
                    }
                } catch (Throwable e) {
                    debug("failed to read " + urlPath, e);
                }
            }
            for (Unit unit : units.values()) {
                String provider = unit.provider;
                String extraClassesKey = provider + "@classes";
                String unitNameKey = provider + "@unitName";
                String unitName = args.getProperty(unitNameKey, "classpath-bootstrap");
                String classes = args.getProperty(extraClassesKey);
                if (classes != null) {
                    debug("parsing value of " + extraClassesKey);
                    try {
                        List< String > list = Arrays.asList(classes.split("[ \n\r\t,]"));
                        unit.classes.addAll(list);
                    } catch (Exception e) {
                        debug("cannot parse: " + classes, e);
                    }
                }
                try {
                    // Hibernate doesn't use byte code modification
                    if (provider.startsWith("org.hibernate")) {
                        debug("skipping: " + provider);
                        continue;
                    } else {
                        debug("starting: " + provider);
                    }
                    PersistenceUnitInfoImpl info = new PersistenceUnitInfoImpl(new Handler());
                    info.setManagedClassNames(new ArrayList(unit.classes));
                    info.setPersistenceProviderClassName(unit.provider);
                    info.setProperties(new Properties());
                    info.setId(unitName);
                    info.setPersistenceUnitName(unitName);
                    info.setRootUrlAndJarUrls("", Collections.EMPTY_LIST);
                    info.setJtaDataSource(new NullDataSource());
                    info.setNonJtaDataSource(new NullDataSource());
                    info.setExcludeUnlistedClasses(true);
                    info.setClassLoader(classLoader);
                    for (String name : unit.classes) {
                        debug("class " + name);
                    }
                    Class clazz = classLoader.loadClass(unit.provider);
                    PersistenceProvider persistenceProvider = (PersistenceProvider) clazz.newInstance();
                    // Create entity manager factory
                    EntityManagerFactory emf = persistenceProvider.createContainerEntityManagerFactory(info, new HashMap());
                    debug("success: " + provider);
                } catch (Throwable e) {
                    debug("failed: " + provider, e);
                }
            }
        } catch (Throwable t) {
            debug("error: ", t);
        }
}