Example usage for javax.servlet ServletContext getMajorVersion

Introduction

In this page you can find the example usage for javax.servlet ServletContext getMajorVersion.

Prototype

public int getMajorVersion();

Source Link

Document

Returns the major version of the Servlet API that this servlet container supports.

Usage

From source file:org.openflamingo.web.util.VersionConfigurer.java

@Override
public void contextInitialized(ServletContextEvent servletContextEvent) {
    Log4jWebConfigurer.initLogging(servletContextEvent.getServletContext());

    Properties properties = new Properties();
    ServletContext context = servletContextEvent.getServletContext();
    InputStream inputStream = null;
    try {//w ww  .  j av a  2 s.c o  m
        inputStream = context.getResourceAsStream("/WEB-INF/version.properties");
        properties.load(inputStream);
    } catch (Exception ex) {
        throw new IllegalArgumentException("Cannot load a '/WEB/INF/version.properties' file.", ex);
    } finally {
        IOUtils.closeQuietly(inputStream);
    }

    StringBuilder builder = new StringBuilder();

    printHeader(builder, "Application Information");
    Properties appProps = new Properties();
    appProps.put("Application", "Flamingo Workflow Engine");
    appProps.put("Version", properties.get("version"));
    appProps.put("Build Date", properties.get("build.timestamp"));
    appProps.put("Build Number", properties.get("build.number"));
    appProps.put("Revision Number", properties.get("revision.number"));
    appProps.put("Build Key", properties.get("build.key"));

    if (context != null) {
        appProps.put("Application Server", context.getServerInfo() + " - Servlet API "
                + context.getMajorVersion() + "." + context.getMinorVersion());
    }

    Properties systemProperties = System.getProperties();
    appProps.put("Java Version", systemProperties.getProperty("java.version", UNKNOWN) + " - "
            + systemProperties.getProperty("java.vendor", UNKNOWN));
    appProps.put("Current Working Directory", systemProperties.getProperty("user.dir", UNKNOWN));

    print(builder, appProps);

    Properties memPros = new Properties();
    final Runtime rt = Runtime.getRuntime();
    final long maxMemory = rt.maxMemory() / MEGA_BYTES;
    final long totalMemory = rt.totalMemory() / MEGA_BYTES;
    final long freeMemory = rt.freeMemory() / MEGA_BYTES;
    final long usedMemory = totalMemory - freeMemory;

    memPros.put("Maximum Allowable Memory", maxMemory + "MB");
    memPros.put("Total Memory", totalMemory + "MB");
    memPros.put("Free Memory", freeMemory + "MB");
    memPros.put("Used Memory", usedMemory + "MB");

    print(builder, memPros);

    printHeader(builder, "Java System Properties");
    Properties sysProps = new Properties();
    for (final Map.Entry<Object, Object> entry : systemProperties.entrySet()) {
        sysProps.put(entry.getKey(), entry.getValue());
    }

    print(builder, sysProps);

    printHeader(builder, "System Environments");
    Map<String, String> getenv = System.getenv();
    Properties envProps = new Properties();
    Set<String> strings = getenv.keySet();
    for (String key : strings) {
        String message = getenv.get(key);
        envProps.put(key, message);
    }

    print(builder, envProps);

    logger.info("=================================================");
    logger.info(" Flamingo Web Services starting...");
    logger.info("=================================================\n{}", builder.toString());
}

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From source file:org.rhq.helpers.rtfilter.util.ServletUtility.java

/**
 * Get the context root for the specified servlet context.
 *
 * @param  servletContext//  ww  w  . j av a2 s  . co m
 *
 * @return
 */
public static String getContextRoot(ServletContext servletContext) {
    String ctxName;

    /*
     * Get the servlet context. If we have servlet spec >=2.5, then there is a method on the servlet context for it.
     * Else we need to do some heuristics (which may be wrong at the end).
     */
    int major = servletContext.getMajorVersion();
    int minor = servletContext.getMinorVersion();
    if (((major == 2) && (minor >= 5)) || (major >= 3)) {
        ctxName = getContextRootFromSpec25(servletContext);
    } else {
        // First we check if the context-root was explicitly given in jboss-web.xml
        ctxName = getContextRootFromJbossWebXml(servletContext);

        // Still nothing? try application.xml
        if (ctxName == null) {
            ctxName = getContextRootFromApplicationXml(servletContext);
        }

        // if all else fails, take the name of the .war
        if (ctxName == null) {
            ctxName = getContextRootFromWarFileName(servletContext);
        }

        if ((ctxName == null) || "".equals(ctxName)) {
            ctxName = "__unknown";
        }
    }
    // Actually the context might always start with / even on Win* so on Unix this is / or /,
    // but this does not harm
    if (ctxName.startsWith(SEPARATOR) || ctxName.startsWith("/")) {
        ctxName = ctxName.substring(1);
    }

    return ctxName;
}

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