StackOverflow2013

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4069556
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2010-11-01T14:03:18.037
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2010-11-01T14:03:18.037
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Here is simplified version of DynamicContentAction.java <pre><code>public class DynamicContentAction extends ActionSupport implements ServletRequestAware, ServletContextAware { private HttpServletRequest request; private ServletContext servletContext; private ResourceSelectorService resourceSelectorService; private String f = null; public String execute() { if ( f != null ) { HashMap<String, Object> resolvedURI = resourceSelectorService.resolveURI(f); if ( resolvedURI.get("ERROR").equals(true) ) { //Generating nice 404 error page content } else { //Generating Content //and put it on request object as: //request.setAttribute("attrName", resourceContent); } } else { //Generating nice 404 error page content } request = null; servletContext = null; f = null; return "index"; } @Override public void setServletRequest(HttpServletRequest request) { this.request = request; } @Override public void setServletContext(ServletContext servletContext) { this.servletContext = servletContext; } public void setF(String f) { this.f = f; } public String getF() { return f; } } </code></pre> as I'm writing this post, I have came to the knowledge that this class is NOT thread-safe. Is it? So I've changed it a little bit as follow: Here is newer version of DynamicContentAction.java <pre><code>public class DynamicContentAction extends ActionSupport { private ResourceSelectorService resourceSelectorService; private String f = null; public String execute() { if ( f != null ) { final HttpServletRequest request = ServletActionContext.getRequest(); final ServletContext servletContext = ServletActionContext.getServletContext(); HashMap<String, Object> resolvedURI = resourceSelectorService.resolveURI(f); if ( resolvedURI.get("ERROR").equals(true) ) { //Generating nice 404 error page content } else { //Generating Content //and put it on request object as: //request.setAttribute("attrName", resourceContent); } f = null; } else { //Generating nice 404 error page content } return "index"; } public void setF(String f) { this.f = f; } public String getF() { return f; } } </code></pre> and the Null thing problem is almost gone, but there is still conflict with the generated content. For example if user try to open: http:// www.domain.com/A http:// www.domain.com/B http:// www.domain.com/C http:// www.domain.com/D http:// www.domain.com/E simultaneously, all of the pages will be rendered in browser, but the content of A is shown in A and B, C is correct, and there is a very good chance that the content of D and E are incorrect too.
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1. This table or related slice is empty.
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1. POSingle action class for multiple dynamic URIs throws exception when concurrent requesting
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1. PTAnswer
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1. USKhosrow
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