JspFactoryImpl.java 文件源码

private PageContext internalGetPageContext(Servlet servlet, ServletRequest request,
        ServletResponse response, String errorPageURL, boolean needsSession,
        int bufferSize, boolean autoflush) {
    try {
        PageContext pc;
        if (USE_POOL) {
            PageContextPool pool = localPool.get();
            if (pool == null) {
                pool = new PageContextPool();
                localPool.set(pool);
            }
            pc = pool.get();
            if (pc == null) {
                pc = new PageContextImpl();
            }
        } else {
            pc = new PageContextImpl();
        }
        pc.initialize(servlet, request, response, errorPageURL, 
                needsSession, bufferSize, autoflush);
        return pc;
    } catch (Throwable ex) {
        ExceptionUtils.handleThrowable(ex);
        if (ex instanceof RuntimeException) {
            throw (RuntimeException) ex;
        }
        log.fatal("Exception initializing page context", ex);
        return null;
    }
}