java - is not abstract and does not override abstract method error -
i totally stuck in 1 of classes showing error:
resettablehttpservletresponse not abstract , not override abstract method getheadernames() in httpservletresponse here entire class:
import java.io.file; import java.io.fileinputstream; import java.io.fileoutputstream; import java.io.filereader; import java.io.ioexception; import java.io.outputstream; import java.io.printwriter; import java.util.arraylist; import java.util.hashset; import java.util.list; import java.util.locale; import java.util.set; import javax.servlet.servletoutputstream; import javax.servlet.http.cookie; import javax.servlet.http.httpservletresponse; import org.apache.commons.io.ioutils; import org.apache.commons.lang.exception.nestableruntimeexception; @suppresswarnings("deprecation") public class resettablehttpservletresponse implements httpservletresponse, resettable { private interface responseoperation { void apply(); } private httpservletresponse wrapped; private list<responseoperation> operations; private locale locale; private int buffersize; private string contenttype; private string charset; private printwriter writer; private outputstream outputstream; private servletoutputstream servletoutputstream; private file contents; private set<string> headernames; private int status; private boolean stateapplied; public resettablehttpservletresponse(final httpservletresponse response) { wrapped = response; operations = new arraylist<responseoperation>(); headernames = new hashset<string>(); resetstate(); } @override public void addcookie(final cookie cookie) { operations.add(new responseoperation() { @override public void apply() { wrapped.addcookie(cookie); } }); } @override public void adddateheader(final string name, final long date) { operations.add(new responseoperation() { @override public void apply() { wrapped.adddateheader(name, date); } }); } @override public void addheader(final string name, final string value) { operations.add(new responseoperation() { @override public void apply() { wrapped.addheader(name, value); } }); } @override public void addintheader(final string name, final int value) { operations.add(new responseoperation() { @override public void apply() { wrapped.addintheader(name, value); } }); } @override public void applystate() { try { // apply operations (final responseoperation operation : operations) { operation.apply(); } // copy response contents, if if (outputstream != null) { try { outputstream.flush(); ioutils.copy(new fileinputstream(contents), wrapped.getoutputstream()); } catch (final exception e) { throw new nestableruntimeexception(e); } } else if (writer != null) { try { writer.flush(); ioutils.copy(new filereader(contents), wrapped.getwriter()); } catch (final exception e) { throw new nestableruntimeexception(e); } } stateapplied = true; } { reset(); } } @override public boolean containsheader(final string name) { return headernames.contains(name); } @override public string encoderedirecturl(final string url) { return wrapped.encoderedirecturl(url); } @override public string encoderedirecturl(final string url) { return wrapped.encoderedirecturl(url); } @override public string encodeurl(final string url) { return wrapped.encodeurl(url); } @override public string encodeurl(final string url) { return wrapped.encodeurl(url); } @override public void flushbuffer() throws ioexception { // no-op, nothing has been done in real response } @override public int getbuffersize() { return buffersize; } @override public string getcharacterencoding() { return charset; } @override public string getcontenttype() { return contenttype; } @override public locale getlocale() { return locale; } @override public servletoutputstream getoutputstream() throws ioexception { if (writer != null) { throw new illegalstateexception("getwriter() invoked in response"); } if (servletoutputstream == null) { contents = file.createtempfile("cyclos_", "_response"); outputstream = new fileoutputstream(contents); servletoutputstream = new servletoutputstream() { @override public void close() throws ioexception { outputstream.close(); } @override public void flush() throws ioexception { outputstream.flush(); } @override public void write(final byte[] b) throws ioexception { outputstream.write(b); } @override public void write(final byte[] b, final int off, final int len) throws ioexception { outputstream.write(b, off, len); } @override public void write(final int b) throws ioexception { outputstream.write(b); } }; } return servletoutputstream; } public int getstatus() { return status; } @override public printwriter getwriter() throws ioexception { if (outputstream != null) { throw new illegalstateexception("getoutputstream() invoked"); } if (writer == null) { contents = file.createtempfile("cyclos_", "_response"); writer = new printwriter(contents); } return writer; } @override public boolean iscommitted() { if (!stateapplied) { return false; } return wrapped.iscommitted(); } @override public void reset() { resetstate(); } @override public void resetbuffer() { ioutils.closequietly(outputstream); ioutils.closequietly(writer); outputstream = null; servletoutputstream = null; writer = null; if (contents != null) { contents.delete(); contents = null; } } @override public void resetstate() { status = 0; operations.clear(); headernames.clear(); charset = wrapped.getcharacterencoding(); buffersize = wrapped.getbuffersize(); contenttype = wrapped.getcontenttype(); locale = wrapped.getlocale(); resetbuffer(); } @override public void senderror(final int sc) { status = sc; operations.add(new responseoperation() { @override public void apply() { try { wrapped.senderror(sc); } catch (final ioexception e) { throw new nestableruntimeexception(e); } } }); } @override public void senderror(final int sc, final string msg) throws ioexception { status = sc; operations.add(new responseoperation() { @override public void apply() { try { wrapped.senderror(sc, msg); } catch (final ioexception e) { throw new nestableruntimeexception(e); } } }); } @override public void sendredirect(final string location) throws ioexception { operations.add(new responseoperation() { @override public void apply() { try { wrapped.sendredirect(location); } catch (final ioexception e) { throw new nestableruntimeexception(e); } } }); } @override public void setbuffersize(final int buffersize) { this.buffersize = buffersize; operations.add(new responseoperation() { @override public void apply() { wrapped.setbuffersize(buffersize); } }); } @override public void setcharacterencoding(final string charset) { this.charset = charset; operations.add(new responseoperation() { @override public void apply() { wrapped.setcharacterencoding(charset); } }); } @override public void setcontentlength(final int len) { operations.add(new responseoperation() { @override public void apply() { wrapped.setcontentlength(len); } }); } @override public void setcontenttype(final string contenttype) { this.contenttype = contenttype; operations.add(new responseoperation() { @override public void apply() { wrapped.setcontenttype(contenttype); } }); } @override public void setdateheader(final string name, final long date) { operations.add(new responseoperation() { @override public void apply() { wrapped.setdateheader(name, date); } }); } @override public void setheader(final string name, final string value) { operations.add(new responseoperation() { @override public void apply() { wrapped.setheader(name, value); } }); } @override public void setintheader(final string name, final int value) { operations.add(new responseoperation() { @override public void apply() { wrapped.setintheader(name, value); } }); } @override public void setlocale(final locale locale) { this.locale = locale; operations.add(new responseoperation() { @override public void apply() { wrapped.setlocale(locale); } }); } @override public void setstatus(final int sc) { status = sc; operations.add(new responseoperation() { @override public void apply() { wrapped.setstatus(sc); } }); } @override public void setstatus(final int sc, final string sm) { status = sc; operations.add(new responseoperation() { @override public void apply() { wrapped.setstatus(sc, sm); } }); } } any 1 tell me supposed rid of error?
edit: have added following method declaration in class not seem affecting error. should do?
@override public collection<string> getheadernames() { operations.add(new responseoperation() { @override public void apply() { wrapped.getheadernames(); } }); return headernames; }
when implement interface class isn't abstract, have redefine methods declared in interface. here did'nt redefine method getheadernames() declared in interface httpservletresponse.
you need override method in class resettablehttpservletresponse
edit :
the error explicit. says forgot override method getheadernames of interface httpservletresponse.
you should read lesson interfaces , inheritance.
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